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This document summarizes the synthesis of novel europium bis- and trisphthalocyaninates with diethyleneglycol substituents. Specifically, it details the design of unsymmetrical phthalocyanine ligand 1 bearing solubilizing groups and diethyleneglycol chains. It then discusses how protecting the hydroxyl groups of ligand 1 with tetrahydropyranyl groups allows for the efficient metalation and formation of double-decker Eu(III) complex 2b and triple-decker Eu(III) complex 3b. Finally, it notes that deprotection of the hydroxyl groups yielded the target complexes 2a and 3a, and that these complexes show potential as components of optical materials
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Epoxide, nomenclature, synthesis, ring opening, regio-selectivity
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tiếng anh chuyên ngành lọc hoá dầu - đại học mỏ địa chất , giảng viên Bùi Th...
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Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...
Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...
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Aprende las medidas y pautas de seguridad adecuadas para practicar deportes acuáticos de riesgo y multiaventura como el rafting, kayak, buceo, barranquismo acuático, etc.
Glosario
El documento presenta un glosario de 10 términos clave relacionados con la educación en México, incluyendo las siglas del Instituto Nacional para la Evaluación de la Educación, los Subsistemas de Educación Básicas, el Sistema de Indicadores Educativos, y el Sistema Educativo Nacional. También incluye las siglas de otras organizaciones gubernamentales como la Secretaría de Educación Pública y la Dirección General de la Planeación y Presupuesto.
Guia del tiempo biologica
El documento describe las contribuciones clave de varios biólogos importantes a lo largo de la historia, incluyendo a Aristóteles, Carl Linneo, Lazzaro Spallanzani, Jean-Baptiste Lamarck, Charles Darwin, Gregor Mendel, y James Watson. Introdujo conceptos como la clasificación biológica moderna, la taxonomía, la herencia genética, la selección natural, y el descubrimiento de la estructura del ADN.
Who to benchmark
This document discusses benchmarking competitors to improve performance. It suggests benchmarking both direct competitors in your industry as well as companies in other industries known for excellence. Benchmarking should leverage existing knowledge of your own company and peers while also considering internal benchmarks to set tactical goals for improvement.
Salvador alvarado preguntas
El municipio de Salvador Alvarado se localiza en el centro-norte de Sinaloa. Limita con los municipios de Sinaloa de Leyva, Guasave, Angostura y Mocorito. Tiene una extensión de 1,197.5 km2 y su principal actividad económica es la ganadería y el comercio. Algunos de sus atractivos turísticos son edificios coloniales, artesanías y aguas termales. Su clima es tropical lluvioso en el este y seco-estepario en el oeste. Tiene una pobl
Altered Books
This document provides information about an altered books art project at Colquitt County High School in 2017. Whitney Pitts served as the supervising art teacher for the project. The template used for the document was courtesy of Smile Templates and is called "Abstraction Canvas PowerPoint Template".
Turismo de aventura.
El turismo de aventura implica viajar a lugares remotos para experimentar la emoción de la aventura. Este tipo de turismo está ganando popularidad ya que los turistas buscan alternativas a las típicas vacaciones en la playa. El turismo de aventura atrae a personas que disfrutan de actividades al aire libre y deportes de riesgo que involucran adrenalina. A menudo, estas actividades se llevan a cabo en entornos naturales y requieren equipo y preparación. Algunas formas populares de turismo de aventura
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Molecules 22-00357
This document describes the synthesis of novel spirooxindole derivatives via a three-component 1,3-dipolar cycloaddition reaction. Various spirooxindole-spiropiperidinone-pyrrolidine and spirooxindole-spiropiperidinone-pyrrolizine derivatives were synthesized in good yields from isatin, sarcosine or L-proline, and Knoevenagel adducts under optimized reaction conditions. The antimicrobial activities of the synthesized compounds were evaluated, with some compounds exhibiting excellent activity against bacteria and fungi, comparable or superior to standard antimicrobial drugs.
Maryam Bachelor thesis
The project will focus on synthesis of hexagonal structured pure phases of compositions: BaM1/3Ti2/3O3-δ and BaM1/6Ti5/6O3-δ, where M= Sc, In and Fe via different methods such as Solid state sintering and wet chemical route. The ultimate goal is to finding structure – functionality relationships within these proton and mixed conducting systems. A substantial effort will focus on search for and fabrication of new materials although the main part of the work will concentrate on detailed structural characterisation (rietveld refinement), impedance spectroscopy, infrared spectroscopy and thermogravimetric analysis.
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This document summarizes research on the synthesis and characterization of nanobuilding blocks based on functionalized silsesquioxane cages. The researchers synthesized a series of [o-4-RStyrPhSiO1.5] cages of different sizes and degrees of functionalization via Heck coupling reactions. They characterized the compounds using various analytical techniques and studied their photophysical properties, including absorption, emission, and two-photon absorption. Unexpected photophysical behaviors were observed that depended on the functional group, cage geometry and degree of substitution. Density functional theory modeling supported the hypothesis that asymmetric bromination during synthesis led to asymmetrically functionalized cages with unusual polarization effects, explaining the observed photophysical properties.
Mechanistic Aspects of Oxidation of P-Bromoacetophen one by Hexacyanoferrate ...
The kinetics of oxidation of p-bromoacetophenone by hexacyanoferrate (III) has been studied in alkaline
medium. The order of reaction with respect of both acetophenone and hexacynoferrate (III) has been found to be
unity. The rate of reaction increases with increase in the concentration of sodium hydroxide.On addition of
neutral KCl, reaction rate increases. The effects of solvent and temperature have been also studied. The product
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Reaction of aniline with ammonium persulphate and concentrated hydrochloric a...
In this paper, the reaction of aniline with ammonium persulphate and concentrated HCl was studied. As a result of our experimental studies, 2,4,6-trichlorophenylamine was identified as the main product. This shows that a high concentration of HCl does not favour oxidative polymerisation of phenylamine, even though the ammonium persulphate/HCl system is widely used in polyaniline synthesis. On the basis of the experimental data and density functional theory for reaction path modelling, we proposed a mechanism for oxidative chlorination of aniline. We assumed that this reaction proceeded in three cyclically repeated steps; protonation of aniline, formation of singlet ground state phenylnitrenium cation, and nucleophilic substitution. In order to confirm this mechanism, kinetic, thermochemical, and natural bond orbital population analyses were performed.
D0212016025
This document describes the synthesis, spectral characterization, and biological screening of transition metal complexes of the ligand 2-(5-mercapto-1,3,4-oxadiazol-2-yl)phenol. A series of complexes were prepared using Cu(II), Co(II), Ni(II), and Zn(II) and characterized using analytical data, magnetic susceptibility, IR, UV-Vis, 1H NMR, 13C NMR, EPR, and other techniques. Spectral data suggest an octahedral geometry around the metal ion. Biological screening showed the complexes have antibacterial, antifungal, and DNA cleavage activities.
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This document summarizes a study on thermoluminescence properties of manganese-doped lithium tetraborate powder and pellet samples synthesized using solution combustion synthesis. X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to characterize the samples. Glow curves exhibited low and high temperature peaks around 100°C and 260°C. Kinetic parameters associated with glow peaks were estimated using various methods. The TL response increased linearly with dose from 0.1-10 Gy and superlinearly up to 100 Gy. Samples were irradiated with photon and electron beams to study energy response, and fading and recycling effects were evaluated under beta exposure. Results showed the samples have adequate sensitivity and linearity
Guest Molecule-Responsive Functional CaPhosphonates proton conductivity (JACS)
This document describes the synthesis and characterization of a calcium phosphonate framework material (Ca-PiPhtA) and its derivatives for proton conductivity applications. The parent framework Ca-PiPhtA-I was synthesized from calcium chloride and the ligand 5-(dihydroxyphosphoryl)isophthalic acid under acidic aqueous conditions, producing a structure with 1D channels and high water content. Upon heating or exposure to ammonia vapors, it undergoes partial dehydration or structural transformations to form new derivatives Ca-PiPhtA-II and Ca-PiPhtA-NH3 respectively, as characterized through methods such as X-ray diffraction and thermal analysis. Proton conductivity measurements found the materials conduct
Visible Spectrophotometric Determination of Gemigliptin Using Charge Transfer...
Visible Spectrophotometric Determination of Gemigliptin Using Charge Transfer...Ratnakaram Venkata Nadh
A visible spectrophotometric method was developed and validated for the determination of gemigliptin present in bulk drug and tablet formulation. It involves an indirect method of charge transfer complex formation in presence of NBS, metol and suphanilic acid. Gemigliptin was subjected to oxidation with excess amount of oxidant (NBS) and the unconsumed NBS oxidizes metol to give p-N-methylbenzoquinone monoamine (PNMM) which in turn forms a charge transfer complex with sulphanilic acid. Then validated the above developed method as per the current ICH guidelines. An excellent correlation coefficient (> 0.999) was found for the obtained regression equation
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Visible Spectrophotometric Determination of Gemigliptin Using Charge Transfer...Ratnakaram Venkata Nadh
A visible spectrophotometric method was developed and validated for the determination of gemigliptin present in bulk drug and tablet formulation. It involves an indirect method of charge transfer complex formation in presence of NBS, metol and suphanilic acid. Gemigliptin was subjected to oxidation with excess amount of oxidant (NBS) and the unconsumed NBS oxidizes metol to give p-N-methylbenzoquinone monoamine (PNMM) which in turn forms a charge transfer complex with sulphanilic acid. Then validated the above developed method as per the current ICH guidelines. An excellent correlation coefficient (> 0.999) was found for the obtained regression equation
(y = –0.0302x + 0.928) in the range of 2.0–30.0 μg mL-1. The method was found to be simple and rapid because it does not involve any solvent extraction. The recovery levels of the drug were in the range 99.92 – 100.08.References
This document summarizes a study on the inhibition of human alkaline phosphatases by vanadate. The key findings are:
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This document summarizes heterogeneous photocatalysis research from the literature. It begins by introducing heterogeneous photocatalysis and its applications. Section II then surveys the types of photocatalytic reactions that have been observed, including oxidations, reductions, isomerizations, substitutions, condensations, and polymerizations. Section III discusses the mechanisms of photocatalysis, involving photoelectrochemistry and the roles of electron-hole pairs, oxygen, hydroxyl radicals, adsorption, and kinetics. Subsequent sections cover topics like active photocatalysts, pretreatment methods, and effects of parameters like pH, temperature, and sensitization.
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The document describes a proposed study to develop a novel class of photoswitchable carboxylic acids whose acidity can be reversibly controlled by light. Dithienylethene compounds will be synthesized that can switch between open and closed states with different light wavelengths. The closed state is expected to be more conjugated, allowing electron donating/withdrawing substituents to influence acidity. Quantum calculations and acidity comparisons will predict acidity changes between states. Target compounds will be synthesized and characterized, with acidity measurements used to validate light-controlled changes. If successful, these photoswitchable acids could enable new applications in catalysis, biochemistry, and more.
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This document describes the design, synthesis, and evaluation of a series of 1,3-disubstituted pyrrolo[2,3-b]quinoxalines as potential inhibitors of phosphodiesterase 4 (PDE4) and cancer cell growth. A ligand- and phase transfer catalyst-free intramolecular Heck reaction was used to synthesize the target compounds. Some compounds showed significant inhibition of PDE4B and growth inhibition of oral cancer cells in vitro. They also showed acceptable safety profiles in zebrafish embryos, but no apoptosis was observed. The goal was to develop PDE4 inhibitors that do not inhibit luciferase, which could produce false positives in assays.
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This document summarizes research on the photocatalytic removal of Rhodamine B dye from water using TiO2 and platinum-deposited TiO2 (Pt/TiO2) under sunlight and UV light. Key findings include:
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This document summarizes the synthesis and characterization of six new highly fluorescent polycyclic azaborine chromophores. The impact of incorporating a nitrogen-boron-hydroxy (N-BOH) unit into heteroaromatic polycyclic compounds was investigated in comparison to N-carbonyl analogs. Insertion of the N-B(OH)-C unit resulted in strong visible absorption, sharp fluorescence, and efficient quantum yields. The solid-state fluorescence displayed a large Stokes shift compared to solution, offsetting self-quenching effects in the solid state. X-ray crystallography confirmed the presence of the N-BOH moiety and an intramolecular hydrogen bond. DFT calculations explained the electronic
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This document discusses an experimental and theoretical study on the anti-corrosive properties of two benzothiazine derivatives, P1 and P2, on mild steel corrosion in 1M HCl solution. Electrochemical impedance spectroscopy, Tafel polarization curves, and weight loss measurements were used to study the inhibition efficiency of P1 and P2 at various concentrations. Both inhibitors showed increased inhibition efficiency with increasing concentration, with P1 and P2 achieving 93% and 96% efficiency, respectively, at 10-3M and 308K. Quantum chemical calculations using density functional theory were also performed to correlate inhibition efficiency with the molecular structure and properties of the inhibitors.
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Poster_Martynov_templated(1)
- 1. The 17th SACI Inorganic ChemistryConference, Grahamstown, South Africa Synthesis of europium bis- and trisphthalocyaninates with diethyleneglycol substituents as precursors for advanced hybrid nanomaterials Alexander G. Martynova , Nhlakanipho Colin Mkhizeb , Alexey V. Yagodina , Yulia G. Gorbunovaa,c , Tebello Nyokongb and Aslan Yu. Tsivadzea,c a A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskiy pr., 31/4, 119071, Moscow, Russia b Department of Chemistry, Rhodes University, PO Box 94, Grahamstown 6140, South Africa c N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskiy pr., 31, 119 991, Moscow, Russia e-mail: Martynov.Alexandre@gmail.com Up to date, there are numerous examples of mono- phthalocyaninates (Pc) conjugated with nanoparticles (NP) and quantum dots (QD), which act as materials for optical limiting and photodynamic therapy. At the same time, the examples of sandwich REE Pcs attached to NPs and QDs are still rare. However, such composites might be perspective components of optical materials due to unique photophysical and electrochromic properties of sandwich Pc complexes. We have designed and synthesized novel unsymmetrical phthalocyanine 1 bearing six solubilizing butoxy-groups and two diethyleneglycol chains with terminal OH-groups, which can be converted afterwards into various anchoring groups (COH,-COOH, -N3, -NH2, -SH, etc.) by conventional methods of organic chemistry. It was shown that synthesis of double- and triple- decker Eu(III) complexes 2a and 3a by direct metalation of 1 with Eu(OAc)3·4H2O in refluxing n-octanol is inefficient. Indeed, even prolonged refluxing of reaction mixture yielded only trace amounts of target complexes 2a and 3a with almost complete recovering of starting ligand 1. This fact can be tentatively assigned to the presence of chelating (OCH2CH2)2OH groups in the molecule of 1, which could interact with Eu3+ ions, interfering therefore with the formation of sandwich complexes. Thus, it was proposed that protection of hydroxyl group in ligand 1 should increase the reactivity of molecule in metalation reaction. Treatment of 1 with 3,4-dihydropyran in the presence of TsOH as a catalyst afforded 4 with tetrahydropyranyl (THP) protective groups. Ligand 4 could be smoothly and selectively converted into double- and triple-decker complexes 2b and 3b by metalation with Eu(OAc)3·4H2O in the presence and in the absence of DBU respectively. Therefore, the influence of free OH-groups in ligand 1 resulting in its low reactivity in metalation reactions was confirmed. Deprotection of OH groups was achieved by treatment of 2b and 3b with TsOH in methanol leading to target complexes 2a and 3a in high yield. All synthesized compounds were characterized by UV-Vis and NMR spectroscopy, as well as by MALDI TOF mass-spectrometry. Acknowledgement: this work was supported by grants from Russian Foundation for Basic Research (14-03- 93972) and National Research Foundation of South Africa UID 92180. Keywords:phthalocyanine, sandwich complexes, europium, metalation, nanomaterials 28th June – 2nd July, 2015