The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
This PDF presentation describes briefly my research experiences in synthetic organic. The time period of these research projects range from 1999 to 10/2005. Projects of later positions were also included but not all. Time period, place of work and position were mentioned at the beginning of each project. To noted that all the experimental synthesis, separation/purification, characterization and spectral interpretation were performed independently by me.
Mixed Ligand, Palladium(II) and Platinum(II) Complexes of Tertiary Diphosphin...Karwan Omer
Palladium(II) and platinum(II) complexes containing the mixed ligands tertiary
diphosphinesdppm. dppp and dppf with Thioester ligand S-1H benzo[d] imidazole-2-yl benzothioate
(HSBIBT) have been prepared by the reaction of PdCl2 and PtCl2 with one equiv of tertiary
diphosphines ligands to form [Pd(k2-dppf)Cl2], [Pd(k2-dppp)Cl2] and [Pt(k2-dppmCl)Cl2] complexes
and then add the ligand HSBIBT to these complexes to form mixed ligand complexes. The prepared
complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, magnetic
susceptibility, molar conductance, IR spectral data and UV-Visible. The results suggested that the
ligand HSBIBT bonded to the metal through N atom and square planner geometries were assigned
for the complexes.
This PDF presentation describes briefly my research experiences in synthetic organic. The time period of these research projects range from 1999 to 10/2005. Projects of later positions were also included but not all. Time period, place of work and position were mentioned at the beginning of each project. To noted that all the experimental synthesis, separation/purification, characterization and spectral interpretation were performed independently by me.
Mixed Ligand, Palladium(II) and Platinum(II) Complexes of Tertiary Diphosphin...Karwan Omer
Palladium(II) and platinum(II) complexes containing the mixed ligands tertiary
diphosphinesdppm. dppp and dppf with Thioester ligand S-1H benzo[d] imidazole-2-yl benzothioate
(HSBIBT) have been prepared by the reaction of PdCl2 and PtCl2 with one equiv of tertiary
diphosphines ligands to form [Pd(k2-dppf)Cl2], [Pd(k2-dppp)Cl2] and [Pt(k2-dppmCl)Cl2] complexes
and then add the ligand HSBIBT to these complexes to form mixed ligand complexes. The prepared
complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, magnetic
susceptibility, molar conductance, IR spectral data and UV-Visible. The results suggested that the
ligand HSBIBT bonded to the metal through N atom and square planner geometries were assigned
for the complexes.
Novel coumarin isoxazoline derivatives: Synthesis and study of antibacterial ...Ratnakaram Venkata Nadh
A highly efficient and mild protocol for the syntheses of ethyl-3-
[7-benzyloxy-4-methyl-2-oxo-2H-8-chromenyl]-5-aryl-4,5-dihydro-4-
isoxazole carboxylates and ethyl-3-[7-benzyloxy-3-chloro-4-methyl-2-
oxo-2H-8-chromenyl]-5-aryl-4,5-dihydro-4-isoxazole carboxylates in
good yields via [3 þ 2] cycloaddition of in situ–generated nitrile
oxides from 7-benzyloxy-4-methyl-coumarin hydroxymoylchlorides
and 7-benzyloxy-3-chloro-4-methyl-coumarin hydroxymoylchlorides
respectively with ethyl-3-aryl prop-2-enoate has been developed.
The new compounds are screened for antibacterial activity.
Twelve dyes were synthesized by diazotizing six primary aromatic amines, which were subsequently coupled with H-acid(1-napthol-8-amino-3,6-disulphonic acid).Each of these amines wasalso diazotized and coupled with abenzoylated H-acid.The colours obtained were mainly pink, red and orange. The various dyes synthesized were applied onto a Nylon 6.6. The molecular weights of the dyes, as well as their molar extinction coefficients were calculated and their solubility in water was determined. Their maximum absorption wavelength was measured in water. The fastness properties of the dyes were also investigated. They had good fastness properties. Benzoylated acid dyes give brighter shades and high wet fastness properties on nylon 6.6, due to their high molecular weight. They also have good exhaustion properties.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
SYNTHESIS AND CHARACTERIZATION OF SCHIFF BASE METAL COMPLEXES DERIVED FROM NA...chemsurya
New Schiff base metal complexes having general structural formulae ML2Cl2 where M= Co(II), Ni(II) and Cu(II), and MLCl2 where M=Zn(II), Cd(II) and Hg(II) were synthesized by the condensation of indoline-2,3-dione (Isatin) and naphtho[2,1-b]furan-2-carbohydrazide. Tentative structures for the synthesized compounds have been elucidated based on analytical, IR, 1HNMR, and Mass spectral studies. Further selected compounds were tested for their antimicrobial activity.
SYNTHESIS AND CHARACTERIZATION OF THERMAL ANALYSIS OF La (II) MACROCYCLIC COM...inventionjournals
The macrocyclic complex compounds of La(II) containing a ligand having tetraoxotetrahydrazin moity are synthesized by template condensation of malonodihydrazide (C3H8N4O2) with different aldehydes. The complexes are characterized on the basis of elemental analysis, UV-visible & IR spectroscopy, magnetic moment and conductance measurement and other physical properties.Antibacterial activity of the derived complex compounds, as well as already used standard compound kanamycin, was tested on fourteen pathogenic bacteria. Given results were then compared to the efficacy of the Antibacterial activity of standard compound kanamycin used for control of these pathogenic bacteria.
Synthesis and Characterization of New Complexes of 2-(6-Methoxybenzo[d]thiazo...IOSR Journals
Abstract: The synthesis and characterization of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ), zinc (ІІ), cadmium (ІІ) and mercury (ІІ) bidentate 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile ligand which was prepared from Benz aldehyde and 6-methoxybenzo[d]thiazol-2-amine in the presence of KCN and acidic medium. The complexes were synthesized by treating an ethanolic solution of the ligand with appropriate amount of metal salts [1:2] [M: L] ratio. The complexes were characterized by using metal and elemental chemical analysis, molar conductance, magnetic susceptibility measurements, FTIR , electronic spectral and mole ratio method. According to the obtained data the probable coordination geometries of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ) zinc (ІІ), cadmium (ІІ) and mercury (ІІ) in these complexes are octahedral. All complexes were found to be non-electrolyte in absolute ethanol, and the complexes were formulated as [ML2Cl2] XH2O. Keywords: 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile, N2-donor, transition metals.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Targeted Intermediates of Eudesmic Acid: Synthesis and X-ray Investigationsijtsrd
it was carried out synthesis of esters and their dinitro derivatives of 3,4,5-trimethoxybenzoic (eudesmic) acid. Esterification of eudesmic acid carried out n absolute methanol or ethanol and corresponding methyl and ethyl 3,4,5-trimethoxybenzoates (2, 3) have been synthesized in good yields. It was revealed that nitration of these esters gives only dinitro products. The structure of the synthesized compounds of the methyl and ethyl 2,6-dinitro-3,4,5-trimethoxybenzoates (4, 5) was determined by X-ray diffraction analysis (XRD). In the asymmetric part of the crystal structures of 4, 5 one and two molecules are observed, respectively. In crystalline structures a flat nitro groups and carboxylic groups do not participate in the conjugation with aromatic rings. In the crystal structure of 4, an intermolecular C8-H...O9 hydrogen bond is observed, these H bonds link the molecules along the [010] axis. In the crystal structure of 5, intermolecular C9B-H...O4A and C10B-H...O8A hydrogen bonds form chains along the [011] axis. The formed chains are cross linked by the intermolecular C9B-H...O5A hydrogen bonds. Olimova M.I. | Okmanov R. Ya. | Elmuradov B. Zh."Targeted Intermediates of Eudesmic Acid: Synthesis and X-ray Investigations" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2417.pdf http://www.ijtsrd.com/chemistry/other/2417/targeted-intermediates-of-eudesmic-acid--synthesis-and-x-ray-investigations/olimova-mi
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
Novel coumarin isoxazoline derivatives: Synthesis and study of antibacterial ...Ratnakaram Venkata Nadh
A highly efficient and mild protocol for the syntheses of ethyl-3-
[7-benzyloxy-4-methyl-2-oxo-2H-8-chromenyl]-5-aryl-4,5-dihydro-4-
isoxazole carboxylates and ethyl-3-[7-benzyloxy-3-chloro-4-methyl-2-
oxo-2H-8-chromenyl]-5-aryl-4,5-dihydro-4-isoxazole carboxylates in
good yields via [3 þ 2] cycloaddition of in situ–generated nitrile
oxides from 7-benzyloxy-4-methyl-coumarin hydroxymoylchlorides
and 7-benzyloxy-3-chloro-4-methyl-coumarin hydroxymoylchlorides
respectively with ethyl-3-aryl prop-2-enoate has been developed.
The new compounds are screened for antibacterial activity.
Twelve dyes were synthesized by diazotizing six primary aromatic amines, which were subsequently coupled with H-acid(1-napthol-8-amino-3,6-disulphonic acid).Each of these amines wasalso diazotized and coupled with abenzoylated H-acid.The colours obtained were mainly pink, red and orange. The various dyes synthesized were applied onto a Nylon 6.6. The molecular weights of the dyes, as well as their molar extinction coefficients were calculated and their solubility in water was determined. Their maximum absorption wavelength was measured in water. The fastness properties of the dyes were also investigated. They had good fastness properties. Benzoylated acid dyes give brighter shades and high wet fastness properties on nylon 6.6, due to their high molecular weight. They also have good exhaustion properties.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
SYNTHESIS AND CHARACTERIZATION OF SCHIFF BASE METAL COMPLEXES DERIVED FROM NA...chemsurya
New Schiff base metal complexes having general structural formulae ML2Cl2 where M= Co(II), Ni(II) and Cu(II), and MLCl2 where M=Zn(II), Cd(II) and Hg(II) were synthesized by the condensation of indoline-2,3-dione (Isatin) and naphtho[2,1-b]furan-2-carbohydrazide. Tentative structures for the synthesized compounds have been elucidated based on analytical, IR, 1HNMR, and Mass spectral studies. Further selected compounds were tested for their antimicrobial activity.
SYNTHESIS AND CHARACTERIZATION OF THERMAL ANALYSIS OF La (II) MACROCYCLIC COM...inventionjournals
The macrocyclic complex compounds of La(II) containing a ligand having tetraoxotetrahydrazin moity are synthesized by template condensation of malonodihydrazide (C3H8N4O2) with different aldehydes. The complexes are characterized on the basis of elemental analysis, UV-visible & IR spectroscopy, magnetic moment and conductance measurement and other physical properties.Antibacterial activity of the derived complex compounds, as well as already used standard compound kanamycin, was tested on fourteen pathogenic bacteria. Given results were then compared to the efficacy of the Antibacterial activity of standard compound kanamycin used for control of these pathogenic bacteria.
Synthesis and Characterization of New Complexes of 2-(6-Methoxybenzo[d]thiazo...IOSR Journals
Abstract: The synthesis and characterization of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ), zinc (ІІ), cadmium (ІІ) and mercury (ІІ) bidentate 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile ligand which was prepared from Benz aldehyde and 6-methoxybenzo[d]thiazol-2-amine in the presence of KCN and acidic medium. The complexes were synthesized by treating an ethanolic solution of the ligand with appropriate amount of metal salts [1:2] [M: L] ratio. The complexes were characterized by using metal and elemental chemical analysis, molar conductance, magnetic susceptibility measurements, FTIR , electronic spectral and mole ratio method. According to the obtained data the probable coordination geometries of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ) zinc (ІІ), cadmium (ІІ) and mercury (ІІ) in these complexes are octahedral. All complexes were found to be non-electrolyte in absolute ethanol, and the complexes were formulated as [ML2Cl2] XH2O. Keywords: 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile, N2-donor, transition metals.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Targeted Intermediates of Eudesmic Acid: Synthesis and X-ray Investigationsijtsrd
it was carried out synthesis of esters and their dinitro derivatives of 3,4,5-trimethoxybenzoic (eudesmic) acid. Esterification of eudesmic acid carried out n absolute methanol or ethanol and corresponding methyl and ethyl 3,4,5-trimethoxybenzoates (2, 3) have been synthesized in good yields. It was revealed that nitration of these esters gives only dinitro products. The structure of the synthesized compounds of the methyl and ethyl 2,6-dinitro-3,4,5-trimethoxybenzoates (4, 5) was determined by X-ray diffraction analysis (XRD). In the asymmetric part of the crystal structures of 4, 5 one and two molecules are observed, respectively. In crystalline structures a flat nitro groups and carboxylic groups do not participate in the conjugation with aromatic rings. In the crystal structure of 4, an intermolecular C8-H...O9 hydrogen bond is observed, these H bonds link the molecules along the [010] axis. In the crystal structure of 5, intermolecular C9B-H...O4A and C10B-H...O8A hydrogen bonds form chains along the [011] axis. The formed chains are cross linked by the intermolecular C9B-H...O5A hydrogen bonds. Olimova M.I. | Okmanov R. Ya. | Elmuradov B. Zh."Targeted Intermediates of Eudesmic Acid: Synthesis and X-ray Investigations" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2417.pdf http://www.ijtsrd.com/chemistry/other/2417/targeted-intermediates-of-eudesmic-acid--synthesis-and-x-ray-investigations/olimova-mi
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
Evaluation of Rubber Seed Oil as Foundry Sand-Core Binder in Castingstheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Sources of Financing Shopping Centers in Lagos Metropolistheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Shellfish shell as a Bio-filler: Preparation, characterization and its effec...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...Al Baha University
Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI)
To cite this article: Samir S. Kandil & Loutfy H. Madkour (1993) Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI), Spectroscopy Letters: An International Journal for Rapid Communication, 26:3, 535-550, DOI: 10.1080/00387019308011552
To link to this article: http://dx.doi.org/10.1080/00387019308011552
2,2.-Biimidazole complexes of Moo2 , Moo2+ and U02f2 have been prepared and characterized by elemental analysis, conductance; and 'H NMR, IR and electronic spectra. Two types of complexes have been identified. Those obtained from slightly acidic solutions have the formulae MOO 22 (H bim)C12.2H20 'l, U02(H2bim)(Ac)2 2 and U02(H2bim)C12.2H20 whereas those from alkaline solutions have the formulae M0~0~(Hbim)~.2H~O 4, and M02(Hbim)2 (M = Mo(V1) 5, U(V1) 6). The infrared spectra of these complexes show characteristic biimidazole frequencies in the 3200-2500, 1550-1000 and 150 cm-l regions as well as metal oxygen double bonds in the 900 cm-l region. complex has been confirmed from 'H NMR signal ratios of The stoichiometries of the acetate
biimidazole to acetate protons at 7.3 and 2.3 ppm, respec- tively. The electronic spectrum of molybdenum(V) complex
showed d-d transition band at =13,500 cm-' in accord with that' reported for copper (d ) imidazole complexes; as well as peaks due to charge transfer bands at 30,000-26,000 c9-l.
Peaks assignable to BIM --+ U(V1) were located at ~26,600 cm . The most probable structures of these complexes have been suggested.
Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...Al Baha University
Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI)
complexes of Moo2 , Moo2+ and U02f2 have been prepared and characterized by elemental analysis, conductance; and 'H NMR, IR and electronic spectra. Two types of complexes have been identified. Those obtained from slightly acidic solutions have the formulae MOO 22 (H bim)C12.2H20 'l, U02(H2bim)(Ac)2 2 and U02(H2bim)C12.2H20 whereas those from alkaline solutions have the formulae M0~0~(Hbim)~.2H~O 4, and M02(Hbim)2 (M = Mo(V1) 5, U(V1) 6). The infrared spectra of these complexes show characteristic biimidazole frequencies in the 3200-2500, 1550-1000 and 150 cm-l regions as well as metal oxygen double bonds in the 900 cm-l region. complex has been confirmed from 'H NMR signal ratios of The stoichiometries of the acetate biimidazole to acetate protons at 7.3 and 2.3 ppm, respec- tively. The electronic spectrum of molybdenum(V) complex
showed d-d transition band at =13,500 cm-' in accord with that' reported for copper (d ) imidazole complexes; as well as peaks due to charge transfer bands at 30,000-26,000 c9-l.
Peaks assignable to BIM --+ U(V1) were located at ~26,600 cm . The most probable structures of these complexes have been suggested.
Spectral studies of 5-({4-amino-2-[(Z)-(2-hydroxybenzylidene) amino] pyrimidi...IOSR Journals
Some transition metal ions Complexes with 5-({4-amino-2-[(Z)-(2-hydroxybenzylidene) amino]
pyrimidin-5-yl} methyl)-2,3,4-trimethoxybenzene were prepared and characterized by elemental analyses,
Infrared , magnetic moment, electronic spectra , mass spectra, X-ray powder diffraction, molar conductance
and thermal analysis (TGA). The complexes have general formulae [ML2.2H2O] {where M = Mn (II), Co (II), Ni
(II), Cu (II), Zn (II), Pd (II) and Pt (II). The coordination behavior of the metal ions towards to the investigated
Schiff base takes place through –C=N,-NH2 and –OH groups. The obtained C, H and N elemental analysis data
showed the Metal: Ligand ratio is 1:2 [M: L] ratio. The molar conductance data reveal that all the metal
complexes are non-electrolytic in nature. From the magnetic moments the complexes are paramagnetic except
Zn metal ion complexes have octahedral geometry with coordination number eight. The thermal behavior of
these complexes shows that, the hydrated complexes have loses two water molecules and immediately followed
by decomposition of the anions and ligand molecules in the second and third stage. The Schiff bases and metal
complexes show good activity against some bacteria. The antimicrobial results indicate that, the metal
complexes have better antimicrobial activity as compared to the prepared Schiff base.
Synthesis, characterization and in vitro Antimicrobial activity of Cu (II) an...IOSR Journals
Abstract: Four Cu(II) and two Ni(II) complexes of azo carboxylate ligands were synthesized and characterized
by conductivity ,UV-visible and Infrared spectroscopy. The comparison of IR spectra of uncoordinated ligands
and their metal complexes indicated that ligands were coordinated to the metal through carboxylic oxygen atom
in bidented fashion. The electronic spectral data suggested square planner geometry of the complexes. The
conductivity study of the complexes indicated Cu(II) complexes are nonelectrolyte while Ni(II) complexes are
electrolyte in nature. All the complexes were tested for their in vitro antibacterial and antifungal activity against
different microbes and compared with standard drugs, Amphotericin-B and Ciprofloxacin. It was observed that
Ni(II)complexes are more effective than the corresponding Cu(II)complexes.Cu(II) complexes were found to be
inactive against the tested fungal species but they show moderate activity against the tested bacterial species.
One of the Ni(II) complex was found to be active in both fungal and bacterial species and also found to be more
effective than the other complexes.
Electrochemical Degradation of Methylen Blue Using Carbon Composite Electrode...iosrjce
Electrochemical oxidation of methylene blue using carbon composite electrode in sodium chloride
solution have been done. The aim of this work was to degradation of methylen blue using the direct oxidation in
undivided electrolysis cell. Carbon composite electrode was prepare by C powder and PVC in 4 mL
tetrahydrofuran (THF) solvent and swirled flatly to homogeneous followed by drying in an oven at 100 °C for 3
h. The mixture was placed in stainless steel mould and pressed at 10 ton/cm2
. Sodium chloride was used
electrolyte solution. The effects of the current and electrolysis time were investigated using cyclic voltammetry,
spectrophotometer UV-Visible and gas chromatography mass spectrometry (GC-MS). The experimental results
showed that the carbon composite electrode have higher effect in the electrochemical degradation of methylene
blue. Based on UV-visible spectra and GC-MS analysis also shows current and electrolysis time for
degradation of methylene blue optimum at 1,5 A and 60 minute, respectively. As a conclusions is this method its
simple equipment, easy operation and friendly for environmental.
Visible Light Photocatalytic Degradation of Methylene Blue and Malachite Gree...IJEAB
A facile solid state metathesis synthesis of barium tungstate (BaWO4) followed by ball milling and subsequent preparation of barium tungstate-graphene oxide (BaWO4–GO) nano composite using a colloidal blending process and its application as a visible light photocatalyst for the degradation of Malachite green and Methylene blue dyes. The morphology and composition of barium tungstate (BaWO4) nano composite have been characterized using X-Ray Diffraction (XRD), UV–Visible Diffuse Reflectance Spectra (UV-DRS), Raman Spectra, Field Emission Scanning Electron Microscopy (FESEM) – EDAX and UV Visible Spectroscopy. This composite material is found to be a wide band gap semiconductor with band gap of 4.3 eV. The sample shows poor transmittance in ultraviolet region while it has maximum transmittance in visible-near infrared regions. It shows an increase in range and intensity of light absorption and the reduction of electron–hole pair recombination in BaWO4 with the introducing of GO on to it.
Synthesis and Thermal Study of Co (II), Ni (II), Cu (II) Mixed Ligand Complex...IOSR Journals
The mixed ligand complexes of Co (II), Ni (II) and Cu (II) with histidine (His.) and 8-hydroxyquinoline (Qui.) have been synthesized and characterized.The resulting complexes were characterized by vibrational and electronic spectral data, thermogravimetric studies , metal analysis and molar conductance measurements. The histidine acts as tridentate ligand, coordinating through the two nitrogen atoms of imidazole ring and the amino group and carboxylate oxygen whereas 8-hydroxyquinoline shows a bidentate nature and the coordination occurs through nitrogen of imine group and oxygen of phenol group. The experimental data suggest that a mononuclear octahedral structure with general formula [M (His.)(Qui.) H2O ] where M= Co (II), Ni (II) and [Cu (His.)(Qui.)H2O] .H2O, thermo gravimetric studies reveal the presence of coordinated water molecules in all complexes. The molar conductance measurements reveal non-electrolytic nature of complexes.
Synthesis and Characterization of Thermal Analysis of La (Ii) Macrocyclic Com...inventionjournals
The macrocyclic complex compounds of La(II) containing a ligand having tetraoxotetrahydrazin moity are synthesized by template condensation of malonodihydrazide (C3H8N4O2) with different aldehydes. The complexes are characterized on the basis of elemental analysis, UV-visible & IR spectroscopy, magnetic moment and conductance measurement and other physical properties.Antibacterial activity of the derived complex compounds, as well as already used standard compound kanamycin, was tested on fourteen pathogenic bacteria. Given results were then compared to the efficacy of the Antibacterial activity of standard compound kanamycin used for control of these pathogenic bacteria.
Si o2 as an efficient and reusable heterogeneous catalyst for the synthesis of 5
The International Journal of Engineering and Science (The IJES)
1. The International Journal of Engineering And Science (IJES)
||Volume|| 2 ||Issue|| 1 ||Pages|| 30-38 ||2013||
ISSN: 2319 – 1813 ISBN: 2319 – 1805
Macrocyclic Cobalt (III) Dioximes By Microwave Assisted
Synthesis And Characterization And 13&14-Membered
Coordination Complexes
1
S.Senthamil Selvi, 2A.Dayalan
1, 2
Department Of Chemistry, Loyola College
Numgampakkum, Chennai-34, India Mobile Number: 9965408417,
Madras University, Chennai-05, India
--------------------------------------------------------------Abstract----------------------------------------------------
The ligand 3,8-dimethyl-5,6-benzo-4,7-diazadeca-3,7-diene-2,9-dione dioxime [(DOH)2 bzo] has been
synthesized by the condensation of O-phenylene diamine with diacetyl monoxime in 1:5 mole ratio.These
complexes have been alkylated using ethanol,actone,DMSO and DMF in the presence of
pyridine,imidazole,benzimidazole and pyridoxine(vitB6) to obtain corresponding macrocyclic organo cobalt
complexes. The parent cobalt complexes and their alkyl derivates have been characterized by elemental
analyses, conductivity data, UV, IR, 1HNMR spectral data and electrochemical behavirour of these complexes
has been studied by yclic voltammetry.
Keywords: Macrocyclic cobalt (III) complexes; Schiff base; Coordination template synthesis; Cyclic
Voltammetry.
--------------------------------------------------------------------------------------- ------------------------------------------------
Date of Submission: 15, December, 2012 Date of Publication: 05, January 2013
--------------------------------------------------------------------------------------------------------------------- ------------------
I. Introduction:
The field of macro cyclic chemistry of metals is developed very rapidly because of its application and
importance in the area of coordination chemistry. Studies on complexes of Schiff base macrocyclic ligand with
different size and number of donor atoms for coordination with a variety cobalt (II) & (III) of porpyrin or corrin
ring system and the metal phthalocyanine complexes have drawn considerable attention in the study of
coordination chemistry of biological interest. Their stability depends on the nature and the geometry of the
ligands. Macrocyclic ligand complexes are more stable then that with the simple ligands. Synthesis of such
macrocyclic complexes is facilitated by the metal ion itself. This is known as template synthesis. Cobalt -60 is a
radioactive metal that is used in radiotherapy. It produces two gamma rays with energies of 1.17 Mev &
1.33Mev. Cobalt is a hard ferromagnetic silver-white element. The Curie temperature is of 1388k with 1.6-
1.7BM per atom. Cobalt commonly present a mixture of two crystallographic structures hcp-fcc with a transition
temperature is 722k. Common oxidation state of +3, +2, +1. Cobalt chloride is a well established chemical
inducer of hypoxia-like responses such as erythropoiesis. Cobalt is small amount is essential to many living
organisms including humans. Having 0.13 to 0.30 mg/kg of cobalt in soils markedly improve the health of
grazing animals.cobalt is a central component of the vitamin B12.Cobalt (II) has d7 configuration and forms
coordination complexes with octahedral and tetrahedral geometries. The stable complexes with cobalt (III), the
stability of trivalent cobalt greatly improved. Trivalent cobalt is also more stable in basic media then in acidic
media the potential for the oxidation in acidic solutions containing no complexing anions is so high that free
cobalt (III) is appreciable concentration rapidly oxidizes water. The tetraza, macrocycles from 13 to16 member
macrocyclic ring are found to be the main trust area in the field of the coordination chemistry of transition and
inner transition metals on coordination, 5 to 7 member chelated rings are produced which are held coplanar with
the metal ion, Compounds containing the group >C=N-OH called oximes, can be derived from aldehyde and
ketone by condensing them with hydroxylamine. This derived from aldehyde are known as aldoximes, those
from ketones as ketoximes. They were first prepared by V. Meyer in 1982. The study of the coordination
chemistry of cobalt (III) dioximes has been extended to imine oximes, which are Schiff bases of carbonyl
oximes and their simplest form they are also bidentate ligands. Cobalt (III) complexes, [C o (L) X2] +; (X= cl- ,
Br-(L= (DOH) 2Bzo)].The cobalt (III) complexes replaced by one chloride and one bromine in axial ligand as
pyridine, imidazole, benzimidazole and vitamin B6 .
www.theijes.com The IJES Page 30
2. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
II. Experimental Methods:
REAGENT:
All chemicals were of analytical reagent grade and solutions were prepared with purified water of L.P
grade.cobaltous chloride, cobaltous bromide was used as such for the synthesis of metal complexes. For
synthesis of ligands(L) O-phenylene diamine and diacetyl monoxime. The metal complexes of Co [(DOH) 2bzo]
Cl2 and Co [(DOH)2 bzo]Br2 replaced by one chloride and one bromide in fixed axial ligand of
pyridine,imidazole,benzimidazole and vitaminB6.
SOLVENT:
Double distilled water was obtained by distilled over alkaline.KMnO 4 in all glass apparatus,it washed the
complexes in diethyl ether and ethanol. The metal complexes prepared mainly used solvent is acetone for the all
synthesis of cobalt complexes
SYNTHESIS OF LIGAND [(DOH)2BZO]:
About 0.05 mole of o-phenylene diamine was added to 200ml of distilled water and the solution was exposed to
microwave in an unmodified microwave oven for 30s.To this 0.1 mole of diacetyl monoxime was added and
again exposed to microwave for about 30s. The solution was set aside for 10 or 24 hours to get straw yellow
product (yield 98% and m.p.176°C it was, filtered, washed with cold water and recrystallised from hot water or
ethanol.
SYNTHESIS OF CHOLO COBALT (III) DIOXIMES:
1. [CO {(DOH)2BZO}CL2]:
About 0.01 moles of CoCl2.6H2o was dissolved in 75ml of acetone with constant stirring for about 10 minutes.
It was then mixed with 0.01 moles of (DOH) 2BZO and stirred well. A green colour core complex was formed. It
was then allowed to stir for one hour. The product was filtered and washed with ether.
2. [Co {(DOH)2Bzo}(Im) Cl]:
About 0.005 mole of dichloro complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005moles of Imidazole and refluxed for about 3 hrs at 40 oC.
The green colored solution turned yellow. The complex thus obtained was washed with ethanol and diethyl
ether.
3. [Co {(DOH)2Bzo}(Bim)Cl
About 0.005 mole of dichloro complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of benzimidazole and refluxed for about 3hrs at
40oC. The green colored solution turned pale brown. The complex thus obtained was washed with ethanol and
diethyl ether.
4. [Co {(DOH)2Bzo}(Py)Cl]
About 0.005 mole of dichloro complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of pyridine and refluxed for about 3hrs at 40 oC.
The green coloured solution turned dark brown. The complex thus obtained was washed with ethanol and
diethyl ether.
5. [Co{(DOH)2Bzo}(Pyn)Cl]
Extraction of pyridoxine hydrochloride
Pyridoxine hydrochloride of required equimolar quantity use as such for preparation of complexes hence
pyridoxine hydrochloride was treated with a base to get free pyridoxine. Here the use of sodium bicarbonate was
over sodium hydroxide was preferred to avoid interference by the hydroxyl ions in the synthesis of complexes.
Pyridoxine hydrochloride was stirred with solution bicarbonate for 6 hour in excess absolute alcohol. Then the
resulting mixture was filtered and the filtered was used as such for preparing the desired complexes.
About 0.005 mole of dichloro complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition with added 0.005 mole of Pyridoxine with condenser and the solution was
stirred for about 3hour at 40oc. The green coloured solution turned brown. That solution was filtered using
sintered crucible and the complex was washed with ethanol and with diethyl ether.
www.theijes.com The IJES Page 31
3. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
III. Synthesis Of Bromo Cobalt (III) Dioximes:
1. [Co {DOH)2Bzo}Br2]
About 0.01 moles of CoBr2.6H2o was dissolved
in 75ml of acetone with constant stirring for about 10 minutes. It was then mixed with 0.01 moles of
(DOH)2Bzo and stirred well. A parrot green colour core complex was formed. It was then allowed to stir for one
hour. The product was filtered and washed with diethyl ether
2. [Co {(DOH)2Bzo}(Im)Br]
About 0.005 mole of dibromo complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of imidazole and refluxed for about 3hrs at 40 oC.
The green colored solution turned pale yellow. The complex was washed with ethanol and diethyl ether.
3. [Co {(DOH)2Bzo}(Bim)Br]
About 0.005 mole of dibromo complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of benzimidazole and refluxed for about 3hrs at
40oC. The green colored solution turned brown. The complex was washed with ethanol and diethyl ether
4. [Co{(DOH)Bzo}(Py)Br]
About 0.005 mole of dibromo complex was added to 75 ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of pyridine and refluxed for about 3hrs at 40 oC.
The green colored solution turned dark brown. The complex was washed with ethanol and diethyl ether.
5. [Co{(DOH)Bzo}(Pyn)Br]
About 0.005 mole of dichloro complex was added to 75ml of ethanol and allowed to stir for five minutes. The
solution under stirring condition was mixed with 0.005 moles of Pyridoxine with condenser and the solution was
stirred for about 3hrs at 40oC. The green coloured solution turned brown. The complex was washed with ethanol
and diethyl ether
PHYSICAL MEASUREMENTS
An ElectronicSpectra study spectrum was conducted on a complex was obtained from LAMBDA-125 spectra
photometer using 1cm matched quartz cells. Alcoholic solution of the complexes of suitable concentrations was
used.UV-Visible spectrometer in the wavelength 200-600 nm.
IR spectra of the complexes were obtained using PERKIN ELMER spectrum-1 in KBr disc by making
pellets of the complexes. The spectra were recorded wavenumber range of 4000-400cm-1.
The 1H magnetic resonance spectra of the complexes were recorded in DMSO-d6 on a JOEL-400 MHZ
NMR spectro photometer at room temperature.
Cyclic voltammogram of the complexes were obtained using general purpose electrochemical system (GPES)
Version 4.9 by using suitable concentration of the complexes.
RESULT AND DISCUSSION:
Characterisation of Ligand[(DOH)2bzo]
The recrystallised pure ligand melts at 276°c as reported in the literature. The UV spectra of the complexes
showed that the position of the high intense absorption and in the range 312-352nm may be attributed to π-π*
transition of the complexes.The absorption band remains unaltered even in their complexes. The moderately
intense bands around 260-340nm which may be ascribed to π-π* of the (DOH)2bzo which also remain unaltered
even in their complexes. The LMCT peak was reported to be disappearing. Upon reduction of the cobalt (III)
complexes by indicating the LMCT nature.
The 1H NMR spectra of cobaloximes clearly showed that on coordination, the δ due to the CH 3 group
of [DOH)2bzo] at 2.382ppm undergoes a downfield shift by 0.43 to 2.33ppm. In the all complexes δ appears as a
singlet indicating the equivalence of four methyl groups present in the structure. The δ due to OH proton in
dioxime appeared at 11.33. This aromatic benzene ring 3, 6 positions is 7.80ppm in an up field Shift and 4, 5
positions is 7.65ppm in an up field shift.
The IR spectrum of ligand shows to the absorption of frequencies to the functional group of phenyl the sharp
band of medium intensity occurred at 699cm-1 is attributed to CH3(oxime) while a similar band at 1384cm-1 is
assigned to –C=N- is 1640cm-1. the N-O stretching vibration is 1215cm-1 is sharp band. The hydrogen bonded
N-OH is assigned to 3430cm-1.
www.theijes.com The IJES Page 32
4. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
Characterisation of chloro cobalt(III) dioxime complexes:
Electronic spectra of the chloro cobalt (III) dioximecomplexes
. No Complexes π-π*λ max π-π* [(DOH)2bzo]λ max LMCT
1 [Co{(DOH)2bzo}Cl2] 332 260 400
2 [Co(DOH)2bzo(Py)Cl] 323 265 410
3 [Co(DOH)2bzo(Im)Cl] 352 270 415
4 [Co(DOH)2bzo(Bim)Cl] 312 275 420
5 [Co(DOH)2bzo(Pyn)Cl] 325 280 425
www.theijes.com The IJES Page 33
5. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
IV. IR Spectrum Of The Chloro Cobalt (III) Dioxime Complexes
1. [Co (DOH)2bzo)Cl2]
The IR spectrum of complex the absorption of frequencies to the functional group of phenyl the sharp band of
medium intensity occurred at 740cm-1 is attributed to CH3(oxime) while a similar band at 1379cm-1 is assigned
to –C=N- is 1627cm-1. The Co-N stretching vibration is 514cm-1 is sharp band. The hydrogen bonded OH is
assigned to 3392cm-1
2. [Co (DOH)2bzo)(Im)Cl]
The IR spectrum of complex to the absorption of frequencies to the functional group of phenyl the sharp band
of medium intensity occurred at 743cm-1 is attributed to CH3(oxime) while a similar band at 1369cm-1 is
assigned to –C=N- is 1670cm-1. The Co-N stretching vibration is 512cm-1 is sharp band. The bonded OH is
assigned to 3282cm-1. The C-H stretching vibration is 2917cm-1 is sharp band. The bonded C-N is assigned to
1331cm-1.The hydrogen bonded N-H is assigned to 3425cm-1.
3. [Co (DOH)2bzo)(Bim)Cl]
The IR spectrum of complex shows to the absorption of frequencies to the functional group of phenyl the sharp
band of medium intensity occurred at 742cm-1 is attributed to CH3(oxime) while a similar band at 1375cm-1 is
assigned to –C=N- is 1619cm-1. The Co-N stretching vibration is 514cm-1 is sharp band. The bonded OH is
assigned to 3399cm-1. The C-H stretching vibration is 3059cm-1 is sharp band. The bonded C-N is assigned to
1307cm-1.The hydrogen bonded N-H is assigned to 3410cm-1.
4. [Co (DOH)2bzo)(Py)Cl]
The IR spectrum of complex shows to the absorption of frequencies to the functional group of phenyl the sharp
band of medium intensity occurred at 742cm-1 is attributed to CH3(oxime) while a similar band at 1375cm-1 is
assigned to –C=N- is 1607cm-1. The Co-N stretching vibration is 513cm-1 is sharp band. The bonded OH is
assigned to 3437cm-1. The C-H stretching vibration is 2917cm-1 is sharp band. The bonded C-N is assigned to
1295cm-1.The hydrogen bonded N-H is assigned to 3475cm-1.
5. [Co (DOH)2bzo)(Pyn)Cl]
The IR spectrum of complex shows to the absorption of frequencies to the functional group of phenyl the sharp
band of medium intensity occurred at 680cm-1 is attributed to CH3(oxime) while a similar band at 1378cm-1 is
assigned to –C=N- is 1637cm-1. The Co-N stretching vibration is 513cm-1 is sharp band. The bonded OH is
assigned to 3437cm-1. The C-H stretching vibration is 2917cm-1 is sharp band. The bonded C-N is assigned to
1295cm-1.
CYCLIC VOLTAMMETRY
1. [Co (DOH) 2 bzo) Cl2]
co[l]2cl2
-2 Cyclic voltammetry
0.125x10
0.100x10-2
0.075x10-2
i/ A
0.050x10-2
0.025x10-2 1
0
-0.025x10-2 3 2
-1.000 -0.500
4 0 0.500 1.000 1.500
E/V
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in potential range -0.8 to 1.5V
contained a reduction and oxidation wave. In the [Co [(DOH) 2Bzo] Cl2], the cathodic peaks arising at -0.334 and
0.322V s-1corresponding to Co2+ and Co+ state respectively. The anodic peak arising at –0.063 Vs-1 and-0.461
Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 4 was found to be 0.0635V.
2. [Co (DOH)2bzo)(Im)Cl]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to 1.5V
contained a reduction and oxidation wave. In the [Co [(DOH)2Bzo] (Im) Cl] complex, the cathodic peaks arising
at -0.330 and 0.352Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic Peak arising at –0.04 Vs-
1
2 and -0.46 Vs-14 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 3 was found to be
0.067Vs-1.
www.theijes.com The IJES Page 34
6. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
co[L]2 imm cl
Cyclic voltammetry
1.500m
1.250m
1.000m
0.750m
i / A
0.500m
1
0.250m
0
-0.250m 2
-0.500m 3
-1.000 -0.500 0 0.500 1.000 1.500
E/V
3. [Co (DOH)2bzo)(Bim)Cl]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to 1.5V
contained a reduction and oxidation wave. Inthe [Co [(DOH) 2Bzo] (Bim) Cl] complex, the cathodic peaks
arising at -0.332 and 0.352Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic peak arising at –
0.042 and -0.464Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 4 was found to be
0.066Vs-1
4. [Co (DOH)2bzo)(Py)Cl]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to
1.5V contained a reduction and oxidation wave. In the [Co[(DOH)2Bzo(Py)Cl] complex, the cathodic peaks
arising at -0.293 and 0.264V corresponding to Co 2+ and Co+ state respectively. The anodic peak arising at –
0.010 and -0.454 V with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 3 was found to be
0.0065Vs-1
5. [Co (DOH)2bzo)(Pyn)Cl]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to 1.5V
contained a reduction and oxidation wave. In the [Co [(DOH) 2Bzo] (Pyn) Cl] complex, the cathodic peaks
arising at -0.293 and 0.264Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic peak arising at –
0.010 and -0.454Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 4 was found to be
0.081Vs-1
Characterisation of bromo cobalt(III)dioxime complexes
www.theijes.com The IJES Page 35
7. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
Electronic spectra of the brom cobalt(III) dioxime complexes
No Complexes π-π*λ max π-π*[(DOH)2bzo]λ max LMCT
1 [Co(DOH)2bzoBr2] 333 285 425
2 [Co(DOH)2bzo(Py)Br] 326 290 430
3 [Co[(DOH)2bzo](Im)Br] 330 300 435
4 [Co(DOH)2bzo(Bim)Br] 322 340 440
5 [Co(DOH)2bzo(Pyn)Br] 338 345 445
IR Spectrum of the bromocobalt (III) dioxime complexes
1. [Co (DOH)2bzoBr2]
The IR spectrum of complexes the absorption of frequencies to the functional group of C-H out of
plane bending intensity occurred at 740cm-1is attributed to CH3while a similar band at 2362cm-1assigned to –
C=N- is 1636cm-1 The Co-N stretching vibration is 512cm-1 is sharp band. The bonded OH is assigned to
3444cm-1 The aromatic C-H vibration is 2995m-1 is sharp band.
2. [Co [(DOH)2bzo(Im)Br]
The IR spectrum of complexes the absorption of frequencies to the functional group of C-H out of plane
bending intensity occurred at 742cm-1 attributed to CH3while a similar band at 2913cm-1assigned to –C=N- is
1670cm-1.Co-N stretching vibration is 511cm-1 is sharp band. The bonded OH is assigned to 3300cm-1.the
aromatic C-H vibration is 3143cm-1is sharp band. The aromatic C-N vibration is 1332cm-1 is sharp band. The
aromatic N-H vibration is 3430cm-1 is sharp band.
3. [Co (DOH)2Bzo(Bim)Br]
The IR spectrum of complexes the absorption of frequencies to the functional group of C-H out of plane
bending intensity occurred at 742cm-1attributed to CH3while a similar band at 2919cm-1assigned to –C=N- is
1620cm-1.Co-N stretching vibration is 514cm-1 is sharp band. The bonded OH is assigned to 3401cm-1.the
aromatic C-H vibration is 3116cm-1is sharp band. The aromatic C- N vibration is 1306cm-1 is sharp band. The
aromatic N-H vibration is 3569cm-1 is sharp band.
www.theijes.com The IJES Page 36
8. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
4. [Co (DOH)2Bzo) (Py) Br]
The IR spectrum of complexes the absorption of frequencies to the functional group of C-H out of plane
bending intensity occurred at 767cm-1 arttributed to CH3while a similar band at 2956cm-1assigned to –C=N- is
1635cm-1.Co-N stretching vibration is 515cm-1 is sharp band. The bonded OH is assigned to 3323cm-1.the
aromatic C-H vibration is 3112cm-1is sharp band. The aromatic C- N vibration is 1368cm-1 is sharp band. The
aromatic N-H vibration is 3417cm-1 is sharp band
5.[Co(DOH)2Bzo(Pyn)Br]
The IR spectrum of complexes the absorption of frequencies to the functional group of C-H out of plane
bending intensity occurred at 720cm-1 attributed to CH3while a similar band at 2946cm-1assigned to –C=N- is
1629cm-1.Co-N stretching vibration is 509cm-1 is sharp band. The bonded OH is assigned to 3369cm-1.the
aromatic C-H vibration is 3143cm-1is sharp band. The aromatic C- N vibration is 1325cm-1 is sharp band. The
aromatic N-H vibration is 3440cm-1 is sharp band.
I
HNMR spectrum bromocobalt (III) dioxime complexes
1. [Co (DOH)2Bzo) Br2]
The 1H NMR spectra of cobaloximes clearly show that on coordination, the δ due to the CH3 group of
[DOH)2Bzo] at 2.382ppm undergoes a downfield shift by 0.43 to 2.33ppm. In the all complexes δ appeared as
a singlet indicating the equivalence of four methyl groups present in the structure. The δ due to OH proton in
dioxime appeared at 11.33. This aromatic benzene ring 3, 6 positions is 7.80ppm in an up field Shift and 4, 5
positions is 7.65ppm in an up field shift.
2. [Co (DOH)2Bzo) (Im) Br]
The 1H NMR spectra of cobaloximes clearly showed that on coordination, the δ due to the CH3 group of
[DOH)2Bzo] at 2.382ppm undergoes a downfield shift by 0.43 to 2.33ppm. In the all complexes δ appeared as a
singlet indicating the equivalence of four methyl groups present in the structure. The δ due to OH proton in
dioxime appeared at 11.33. This aromatic benzene ring 3, 6 positions is 7.80ppm in an up field Shift and 4, 5
positions is 7.65ppm in an up field shift. The imidazole down field multiplicity and quarterticare was obtained
3. [Co (DOH)2Bzo) (Bim)Br]
The 1H NMR spectra of cobaloximes clearly showed that on coordination, the δ due to the CH 3 group of
[DOH)2Bzo] at 2.382ppm undergoes a downfield shift by 0.43 to 2.33ppm. In the all complexes δ appeared as a
singlet indicating the equivalence of four methyl groups present in the structure. The δ due to OH proton in
dioxime appeared at 11.33. This aromatic benzene ring 3, 6 positions is 7.80ppm in an up field Shift and 4, 5
positions is 7.65ppm in an up field shift. The Benzimidazole down field multiplicity and quarterticare was
obtained.
Cyclic Voltammetry
1. [Co [(DOH)2Bzo] Br2]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to
1.5V contained a reduction and oxidation wave. In the [Co [(DOH) 2Bzo]Br2] complex, the cathodic peaks
arising at -0.491 and 0.681Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic peak arising at –
0.256 Vs-1 and -0.332 Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 2 and 3 was found to be
0.079Vs-1
co[L]2 br2
-4 Cyclic voltammetry
0.100x10
0 2
-0.100x10-4 1
-0.200x10-4
i/ A
-0.300x10-4 3
-0.400x10-4
4
-0.500x10-4
-4
-0.600x10
-1.000 -0.750 -0.500 -0.250 0 0.250 0.500 0.750 1.000
E/V
2. [Co [(DOH)2Bzo](Im) Br]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to
1.5Vs-1 contained a reduction and oxidation wave. In the [Co [(DOH)2Bzo](Im) Br] complex, the cathodic peaks
arising at -0.347 and 0.291Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic peak arising at –
0.466 Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 3 was found to be 0.0595Vs-1
www.theijes.com The IJES Page 37
9. Macrocyclic Cobalt (Iii) Dioximes By Microwave Assisted Synthesis And Characterization
co[L]2 br imm
Cyclic voltammetry
0.125x10-2
0.100x10-2
0.075x10-2
i/A
0.050x10-2
0.025x10-2 1
0
-0.025x10-2 2
-1.000 -0.500
3 0 0.500 1.000 1.500
E/V
3. [Co [(DOH)2Bzo](Bim) Br]
The cyclic voltammogram on a glassy carbon electrode with Ag/AgCl system in the potential range -0.8 to
1.5Vs-1 contained a reduction and oxidation wave. In the [Co [(DOH) 2Bzo](Bim) Br] complex, the cathodic
peaks arising at -0.359 and 0.266Vs-1 corresponding to Co2+ and Co+ state respectively. The anodic peak arising
at –0.461 Vs-1 with respect to Co2+ and Co3+ state. The ∆E value of position 1 and 3 was found to be 0.051V.
CONCLUSIONS
In conclusion it could be stated that the macrocyclic dioxime Viz [(DOH) 2bzo] behaves like
dimethylglyoxime. So that the cobalt (III) macro cyclic dioxime prepared shows similarity to cobaloximes. It is
used as a model compound for vitamin-B12 the catalytic activity was found to be mainly depending on
heterocyclic axial ligand viz., pyridine, imdazole, benzimidazole, and pyridoxine. This may be attributed to
greater tendency for the complexes to undergo protonation becoming more positive in the case.
ACKNOWLEDGEMENTS
We would like to acknowledge the financial support of Loyola College, Chennai.I think my guide on
Dr.A.Dayalan, H.O.D of chemistry Loyola College, Chennai.
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