Ion Molecule Reaction
Mostrando 1-12 de 53 artigos, teses e dissertações.
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1. An Efficient and Recyclable Sn-Based Phosphotungstic Acid with Tunable Brønsted/Lewis Acidity for Selective Oxidation of Benzyl Alcohol
A series of metal ion (M = Sn2+, Fe3+, Ni2+, Co2+, Ag+, Cu2+) exchanged tungstophosphoric acid (H3PW12O40; TPA) catalysts with tunable Brønsted/Lewis acidity were synthesized and exploited for the oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using hydrogen peroxide (H2O2) as oxidant. The structure of these M-TPA composite salts was also characte
J. Braz. Chem. Soc.. Publicado em: 2021-01
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2. THEORETICAL RESEARCH ON THE MULTI-CHANNEL REACTION MECHANISM AND KINETICS OF HNCS WITH OH-
We presented a theoretical study on the detailed reaction mechanism and kinetics of the HNCS molecule with the OH-. The barrierless minimum energy path and the most favorable entrance channel have been determined by study the thermodynamic and kinetic characters of the channel with low energy barrier. The B3LYP/6-311++G** method was employed for all the geom
Quím. Nova. Publicado em: 2017-10
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3. Strategies for Molecular Diversification of 2-[Aminoalkyl-(1H-1,2,3-triazol-1- yl)]-1,4-naphthoquinones Using Click Chemistry
Click chemistry-based strategies for the synthesis of 2-amino-alkyl-1,2,3-triazole-1,4-naphthoquinone derivatives make it possible to obtain desired products from 1,4-naphthoquinone (1,4-NQ), and bio-based lawsone, nor-lapachol and lapachol. The first route (Strategy A) starting from 1,4-NQ and amino alcohols, then 2-amino-alkyl-1,4-NQ alcohols, were tosylat
J. Braz. Chem. Soc.. Publicado em: 2017-04
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4. Synthesis and structural analysis of Urânium and Vanadium whit piridoxine derivated ligands. / Síntese e análise estrutural de complexos de Urânio e Vanádio com ligantes derivados da piridoxina.
Uranyl and vanadyl complexes with ligands with oxygen and nitrogen donors atoms have been extensively reviewed and aroused remarkable interest on account their high stability but, a few complexes of piridoxine derived ligands have been reported in the literature. This lack was the inspiration to search new piridoxine derived ligands and uranyl and vanadyl co
Publicado em: 2009
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5. Estudo da desativação do agente VX usando o MgO por cálculos ab initio
The organophosphates are used in industry, in the fields of dyes, varnishes, artificial leather, electrical insulation, waterproofing, plastics, oil additives and solvents, are also used in medicine to treat diseases such as glaucoma, in the household and in agriculture are applied as insecticides and pesticides. Besides these various civilian facilities, th
Publicado em: 2009
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6. Estudo da remoÃÃo e degradaÃÃo dos corantes Remazol Black B e Remazol Red RB 133%, e do fÃrmaco Ganciclovir, com aplicaÃÃo de Processos Oxidativos AvanÃados
The contamination of rivers, seas, lakes and oceans is one of the major problems of modern society, caused in large part by industrial activities. Textile processing, particularly generate great amounts of effluent characterized by a high organic load, strong color and toxic chemical compounds, which, depending on the dye, can also contain mutagenic, carcino
Publicado em: 2009
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7. Desenvolvimento e aplicação de um novo ensaio para a determinação eletroquímica da capacidade antioxidante de compostos modelo e de matrizes complexas / Development and application of a new assay for the electrochemical determination of the antioxidant capacity of model compounds and of complex matrices
This work describes the development and practical applications of a novel and simple electrochemical methodology for the determination of the antioxidant capacity of specific model molecules and/or some complex food samples currently consumed in Brazil. Other systems having either theoretical or technological interest were also investigated. The method is ba
Publicado em: 2009
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8. Energética e mecanismos de processos iônicos em fase gasosa / Energetics and mechanisms of gas-phase ionic processes
The study of ionic reactivity in the gas-phase has been widely explored with mass spectrometry techniques. This thesis reports experimental and theoretical results in three different areas of gas-phase ion chemistry. The ionic processes were experimentally studied by Fourier transform mass spectrometry (FTMS or FT-ICR), a high resolution method that allows f
Publicado em: 2007
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9. SÃntese e estudo espectroscÃpico de complexos de Ãons lantanÃdeos incorporados em materiais hÃbridos orgÃnicos-inorgÃnicos
In this work two new europium and gadolinium b-diketonate complexes, [Ln(btfa)3(4,4 -bpy)(EtOH)] (Ln = Eu, Gd; 4,4 -bpy = 4,4 -bipyridine; btfa = 4,4,4- trifluoro-l-phenyl- 1,3-butanedione), were prepared and incorporated into a organicinorganic hybrid material. The general formulae of these complexes were confirmed by X-rays single crystal data and elementa
Publicado em: 2007
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10. Reactivity and dissociation of organic ions and organometallics compounds by mass spectrometry / Reatividade e dissociação de ions organicos, organometalicos e metalo-organicos por espectrometria de massas
Os dois primeiros capítulos desta tese foram desenvolvidos em um espectrômetro de massas pentaquadrupolar. No capítulo 1 foi proposto uma definição mais extendida para os íons distônicos: "íons distônicos são aqueles que apresentam alto grau de separação dos sítios de carga e spin". Escolheu-se o composto 2-metileno-1,3-dioxolano, que pela defin
Publicado em: 2004
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11. Caracterização das reações do nitroprussiato de sodio com tiois e oxihemoglobina
Nitric oxide (NO) is a messenger molecule synthesized by mammals and plays a large number of biological roles, including the control of arterial pressure, neurotransmission and the inhibition of platelet aggregation. Sodium nitroprusside ([Na2[Fe (CN)5(NO)], SNP) is an NO donor metal complex used clinically for over 70 years in the control of hypertension cr
Publicado em: 2003
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12. Gas-phase ion chemistry of silyl cations obtained from hexamethyldisilazane
The gas-phase ion-molecule reactions of the Me3SiN(H)SiMe2+ ion, obtained by electron ionization from Me3SiN(H)SiMe3, have been studied in a Fourier transform ion cyclotron resonance spectrometer in order to understand the mechanistic details of an important chemical system presently used in film formation. This silyl cation has been observed to undergo addi
Química Nova. Publicado em: 2002-09