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11.
E. P. Medyantseva D. V. Brusnitsyn R. M. Varlamova O. I. Medvedeva M. P. Kutyreva N. A. Ulakhovich A. N. Fattakhova O. A. Konovalova G. K. Budnikov 《Russian Journal of Applied Chemistry》2017,90(1):97-105
The use of hyperbranched polyesterpolyols of different generations favors firmer fixation of carbon nanotubes and silver nanoparticles as components of composite materials on the electrode surface (0.028 mg cm–2), which improves the operation characteristics of monoamine oxidase biosensors. The size of silver nanoparticles (18–52 nm) depends on the conditions for preparing hyperbranched polyesterpolyols, and their use as electrode modifiers influences the analytical possibilities of amperometric biosensors. Silver nanoparticles (18 nm, data of atomic force microscopy) in polyesterpolyols of third generation (pH 10.0) as components of the developed biosensors extend the interval of determinable concentrations to 1 × 10–4–1 × 10–8 M and decrease the lower limit of determination to 3 × 10–9 M, compared to the unmodified sensors, owing to enhancement of the analytical signal. The developed biosensors were tested in monitoring of drugs (antidepressants) in Coaxil and Auroriks drug forms with the relative standard deviation on the level of 0.052. 相似文献
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Ishmaeva E. A. Kataev V. E. Vereshchagina Ya. A. Fattakhova G. R. Bazhanova Z. G. Kataev A. V. 《Russian Journal of General Chemistry》2003,73(6):888-895
The structure of cyanophosphines and their oxides was studied by ab initio (RHF/6-31G**) and semiempirical (PM3) methods. Both methods predict that MeOP(CN)2, (MeO)2PCN, and (MeO)2P(O)CN exist in noneclipsed antiperiplanar and synclinal conformations. The calculation results nicely agree with measured dipole moments and Kerr constants of these compounds. The phenyl and diphenyl derivatives PhP(CN)2, Ph2PCN, Ph(Et)PCN, and Ph2P(O)CN prefer forms in which the phenyl ring plane is eclipsing the phosphorus lone electron pair or the phosphoryl bond. The interactions of the phosphorus lone electron pair with the phenyl ring and with the cyano group are lacking in the title compounds. 相似文献
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Magdalena Skunik Beata Baranowska Dina Fattakhova Krzysztof Miecznikowski Malgorzata Chojak Alexander Kuhn Pawel J. Kulesza 《Journal of Solid State Electrochemistry》2006,10(3):168-175
Using the layer-by-layer technique, carbon submicroparticles, that have been modified and stabilized with monolayers of Keggin-type
phosphododecamolybdate (PMo12O403−), can be dispersed in multilayer films of organic polymers, poly(3,4-ethylenedioxythiophene), i.e., PEDOT, or poly(diallyldimethylammonium)
chloride, i.e., PDDA, deposited on glassy carbon or indium-tin oxide conductive glass electrodes. The approach involves alternate
treatments in the colloidal suspension of PMo12O403−-covered carbon submicroparticles in the solution of monomer, 3,4-ethylenedioxythiophene or in solution of PDDA polymer. Electrostatic
attractive interactions between anionic phosphomolybdate-modified carbon submicroparticles and cationic polymer layers permit
not only uniform and controlled growth of the hybrid organic–inorganic film but also contribute to its overall stability.
The system composed of PMo12O403−-covered carbon submicroparticles dispersed in PEDOT is characterized by fast dynamics of charge transport and has been used
to construct symmetric microelectrochemical redox capacitor. The PDDA-based system has occurred to be attractive for electrocatalytic
reduction of hydrogen peroxide. 相似文献
14.
Inside Back Cover: Zintl Clusters as Wet‐Chemical Precursors for Germanium Nanomorphologies with Tunable Composition (Angew. Chem. Int. Ed. 7/2016)
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15.
V. M. Berestovitskaya E. A. Ishmaeva I. A. Litvinov O. S. Vasil'eva Ya. A. Vereshchagina E. S. Ostroglyadov G. R. Fattakhova D. V. Beskrovnyi S. M. Aleksandrova 《Russian Journal of General Chemistry》2004,74(7):1108-1114
Previously unknown 2-(1,2-dimethylindol-3-yl)-1-nitroethene was synthesized, and procedures for preparing 2-(1-methylbenzimidazol-2-yl)- and 2-(3-pyridyl)-1-nitroethens were improved. The structures of the products were determined by spectroscopic methods and from their dipole moments. According to single crystal X-ray diffraction data, the (E)-2-(1-methylbenzimidazol-2-yl)-1-nitroethene molecules are virtually planar and are packed in stacks in the crystal lattice, with appreciable stacking interaction. 相似文献
16.
S. A. Meshcheryakova V. A. Kataev D. A. Munasipova I. Ya. Fattakhova 《Russian Journal of General Chemistry》2014,84(5):865-868
Oxidation of 6-methyl-1-(thiethan-3-yl)pyrimidine-2,4(1H,3H)-dione, 5(6)-nitro-1-(thiethan-3-yl)-benzimidazole, 2-methyl-4-nitro-1-(thiethan-3-yl)- and 5-bromo-2-methyl-4-nitro-1-(thiethan-3-yl)imidazoles was examined. Corresponding 1-oxothietan-3-yl- and 1,1-dioxothietan-3-yl derivatives were synthesized for the first time. Some factors affecting the quality of the final products and optimal conditions of the oxidation of thietanyl derivatives of pyrimidine-2,4(1H,3H)-dione, nitrobenzimidazole, and nitroimidazole were found. According to 1H NMR spectroscopy data, the obtained sulfoxides are mixtures of cis/trans isomers, the diastereomers ratio determined by the substituent at position 3 of thietane ring. 相似文献
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A. N. Il’ichev Z. T. Fattakhova D. P. Shashkin V. A. Matyshak V. N. Korchak 《Kinetics and Catalysis》2017,58(3):300-310
CO adsorption on (0.5–15)%CoO/ZrО2 catalysts has been investigated by temperature-programmed desorption and IR spectroscopy. At 20°С, carbon monoxide forms carbonyl and monodentate carbonate complexes on Co m 2+ O n 2- clusters located on the surface of crystallites of tetragonal ZrO2. With an increasing CoO content of the clusters, the amount of these complexes increases and the temperature of carbonate decomposition, accompanied by CO2 desorption, decreases from 400 to 304°С. On the 5%CoO/ZrО2 sample, the carbonyls formed on the Со2+ and Со+ cations and Со0 atoms decompose at 20, 90, and 200–220°С, respectively, releasing CO. At 20°С, they are oxidized by oxygen to monodentate carbonates, which decompose at 180°С. Adsorbed oxygen decreases the temperature of their decomposition on oxidation sites by ~40°C, and the sample remains in an oxidized state ensuring the possibility of subsequent CO adsorption and oxidation. The rate of the oxidation of 5%CoO/ZrО2 containing adsorbed CO by oxygen is higher than the rate of the oxidation of the same sample reduced by carbon monoxide, because the latter reaction is an activated one. In view of the properties of the complexes, it can be concluded that the carbonates decomposing at 180°С are involved in CO oxidation by oxygen from the gas phase in the presence of hydrogen, a process occurring at 50–200°С. The rate-limiting step of this process the decomposition of the carbonates, which is characterized by an activation energy of 77–94 kJ/mol. 相似文献
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A. N. Il’ichev D. P. Shashkin T. I. Khomenko Z. T. Fattakhova V. N. Korchak 《Kinetics and Catalysis》2010,51(5):743-753
It was established by X-ray diffraction, TPR, and EPR that microemulsion (m.e.) synthesis yields the binary oxides ZrO2(m.e.) and CeO2(m.e.) and the mixed oxide Zr0.5Ce0.5O2(m.e.) in the form of a tetragonal, cubic, and pseudocubic phase, respectively, having crystallite sizes of 5–6 nm. The bond
energy of surface oxygen in the (m.e.) samples is lower than in their analogues prepared by pyrolysis. Hydrogen oxidation
on the oxides under study occurs at higher temperatures than CO oxidation. ZrO2(m.e.) and CeO2(m.e.) are active in O2− formation during NO + O2 adsorption, while CeO2 is active during CO + O2 adsorption, too. However, its amount here is one-half to one-third its amount in the pyrolysis-prepared samples, signifying
a reduced number of active sites, which are Zr4+ and Ce4+ coordinatively unsaturated cations and Me4+-O2− pairs. O2− radical anions are stabilized in the coordination sphere of Zr4+ coordinatively unsaturated cations via ionic bonding, and in the sphere of Ce4+ cations, via covalent bonding. Ionic bonds are stronger than ionic-covalent bonds and do not depend on the ZrO2 phase composition. Zr0.5Ce0.5O2 is inactive in these reactions because of the strong interaction of Zr and Ce cations. It is suggested that Ce(4 + β)+ coordinatively unsaturated cations exist on its surface, and their acid strength is lower than that of Zr4+ and Ce4+ cations in ZrO2 and CeO2, according to the order ZrO2 > CeO2 ≥ Zr0.5Ce0.5O2. Neither TPR nor adsorption of probe molecules revealed Zr cations on the surface of the mixed oxide. 相似文献