93
•
1 like•74 views
Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI)
![dth="100%"> [ hide message ]
Synthesis and Characterization
of 2,2-Biimidazole Complexes of
Oxocations of Molybdenum (VI,
V) and Uranium(VI)
Authors: Samir S. Kandil a;Loutfy H. Madkour a
DOI: 10.1080/00387019308011552
Publication Frequency: 8 issues per year
Published in: Spectroscopy Letters, Volume 26, Issue 3 March 1993 , pages 535 -
550
Subjects: Analytical Chemistry; Chemical Spectroscopy; Chemistry;
Formats available: PDF (English)
View Article: View Article (PDF)
Affiliation:
a Chemistry Department, Faculty of Sciences, Tanta University, Tanta,
EGYPT
Abstract
2,2'-Biimidazole complexes of MoO2
+2, MoO2
+ and UO2
+2 have been prepared and
characterized by elemental analysis, conductance; and 1H NMR, IR and electronic
spectra. Two types of complexes have been identified. Those obtained from slightly
acidic solutions have the formulae MoO2 (H2bim)Cl2.2H2O 1, UO2(H2bim) (Ac)2 2 and
UO2(H2bim)Cl2.2H2O 3; whereas those from alkaline solutions have the formulae
Mo2O4(Hbim)2.2H2O 4, and MO2(Hbim)2 (M = Mo(VI) 5, U(VI) 6). The infrared spectra
of these complexes show characteristic biimidazole frequencies in the 3200-2500,
1550-1000 and 750 cm-1 regions as well as metal oxygen double bonds in the 900
cm-1 region. The stoichiometries of the acetate complex has been confirmed from 1H
NMR signal ratios of bimidazole to acetate protons at 7.3 and 2.3 ppm, respectively.
The electronic spectrum of molybdenum(V) complex showed d-d transition band at
≃13,500 cm-1 in accord with that reported for copper (d9) imidazole complexes; as
well as peaks due to charge transfer bands at 30,000-26,000 cm-1 Peaks assignable
to BIM U(VI) were located at ≃26,600 cm-1. The most probable structures of these
complexes have been suggested.
Bookmark with: CiteULike Del.icio.us BibSonomy Connotea More
bookmarks
Page 1 of 1Synthesis and Characterization of 2,2
-
Biimidazole Complexes of Oxocations of Mol
...
4/12/2010file://C:Documents and SettingskaauDesktopSynthesis and Characterization of 2,2
-...](https://image.slidesharecdn.com/93-150318142317-conversion-gate01/85/93-1-320.jpg)
Recommended
Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Similar to 93
Similar to 93 (20)
Recently uploaded
Recently uploaded (20)
93
- 1. dth="100%"> [ hide message ] Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI) Authors: Samir S. Kandil a;Loutfy H. Madkour a DOI: 10.1080/00387019308011552 Publication Frequency: 8 issues per year Published in: Spectroscopy Letters, Volume 26, Issue 3 March 1993 , pages 535 - 550 Subjects: Analytical Chemistry; Chemical Spectroscopy; Chemistry; Formats available: PDF (English) View Article: View Article (PDF) Affiliation: a Chemistry Department, Faculty of Sciences, Tanta University, Tanta, EGYPT Abstract 2,2'-Biimidazole complexes of MoO2 +2, MoO2 + and UO2 +2 have been prepared and characterized by elemental analysis, conductance; and 1H NMR, IR and electronic spectra. Two types of complexes have been identified. Those obtained from slightly acidic solutions have the formulae MoO2 (H2bim)Cl2.2H2O 1, UO2(H2bim) (Ac)2 2 and UO2(H2bim)Cl2.2H2O 3; whereas those from alkaline solutions have the formulae Mo2O4(Hbim)2.2H2O 4, and MO2(Hbim)2 (M = Mo(VI) 5, U(VI) 6). The infrared spectra of these complexes show characteristic biimidazole frequencies in the 3200-2500, 1550-1000 and 750 cm-1 regions as well as metal oxygen double bonds in the 900 cm-1 region. The stoichiometries of the acetate complex has been confirmed from 1H NMR signal ratios of bimidazole to acetate protons at 7.3 and 2.3 ppm, respectively. The electronic spectrum of molybdenum(V) complex showed d-d transition band at ≃13,500 cm-1 in accord with that reported for copper (d9) imidazole complexes; as well as peaks due to charge transfer bands at 30,000-26,000 cm-1 Peaks assignable to BIM U(VI) were located at ≃26,600 cm-1. The most probable structures of these complexes have been suggested. Bookmark with: CiteULike Del.icio.us BibSonomy Connotea More bookmarks Page 1 of 1Synthesis and Characterization of 2,2 - Biimidazole Complexes of Oxocations of Mol ... 4/12/2010file://C:Documents and SettingskaauDesktopSynthesis and Characterization of 2,2 -...