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Oleg G. Sinyashin Elvira S. Batyeva Oleg V. Ugryumov Ilyas S. Nizamov Olga A. Varnavskaya S. I. Vasyukov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-3):21-23
Abstract Novel ammonium salts of O,O-dialkyl dithiophosphoric acids were obtained by one-pot synthesis from white phosphorus, elemental sulfur, industrial alcohols or phenols, and amines. Long-chain S-alkyl O,O-dialkyldithiophosphonates were prepared by the reaction of red phosphorus with elemental sulfur, alcohols, and the cheap industrial fractions of С16–С18 and С20–С26 of higher α-olefins in the presence of Lewis acid catalyst. The dithiophosphates obtained possess the high anticorrosion activities toward mild steel. 相似文献
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V. P. Smagin N. S. Koryagina G. A. Kryvshenko O. A. Varnavskaya 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(1):56-58
The interaction of neodymium(III) with 2,2′-dipyridyl (2,2′-Dipy) in solvents with permittivities of from 5 to 78 units was studied spectrophotometrically. The Nd(III): 2,2′-Dipy ratios and complex stability constants were determined. Suggestions concerning the influence of solvents on complex formation in the systems were advanced. 相似文献
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V. P. Smagin O. A. Varnavskaya E. V. Yudina 《Russian Journal of Inorganic Chemistry》2006,51(9):1451-1457
Complex formation in a Ln(III)-1,10-phenanthroline-ethyl acetate system, where Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, or Lu, is studied by spectrophotometric methods. The stability of the complexes is estimated. The changes in the thermodynamic parameters of complex formation and the bonding character in the lanthanide complexes with 1,10-phenanthroline and 2,2′-dipyridyl are ascertained and compared. 相似文献
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O. A. Varnavskaya É. A. Ishmaeva V. M. D'yakov N. M. Kudyakov 《Russian Chemical Bulletin》1978,27(9):1880-1881
Conclusions A study was made of the IR spectra and dipole moments of some heterocycles that simultaneously contain phosphorus and silicon atoms. The preferential conformation of the dioxasilaphosphorinanes is discussed.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2129–2131, September, 1978.The authors are indebted to A. B. Remizov for the IR spectral study of 2,2,5-trimethyl-1,3,2,5-dioxasilaphosphorinane. 相似文献
5.
I. V. Burykin Yu. A. Andreev A. A. Varnavskaya 《Journal of Analytical Chemistry》2014,69(10):1017-1021
Procedures for determining 5-ethoxy-2-[2-(morpholino)ethylthio]benzimidazole dihydrochloride, an active component of the Afobazol medicinal preparation, and its potential impurities, 5-ethoxybenzimidazol-2-thione and N-(2-chloroethyl)morpholine hydrochloride by capillary zone electrophoresis in the range 2.0 × 10?5 to 2.0 × 10?3 M and ligand-exchange capillary electrophoresis in the range 1.0 × 10?5 to 5.0 × 10?3 M are developed. The optimum conditions for the separation and determination of these analytes using a quartz capillary tube are found. The reliability of the results obtained by capillary electrophoresis was confirmed by gas chromatography with a mass-selective detector. 相似文献
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V. A. Solodov O. A. Varnavskaya L. K. Khvatova B. R. Fakhrutdinov N. A. Lebedev I. N. Diyarov 《Russian Journal of Applied Chemistry》2005,78(6):944-949
Sorbitol-based block copolymers of ethylene and propylene oxides were synthesized and characterized as surfactants and demulsifiers.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 6, 2005, pp. 966–971.Original Russian Text Copyright © 2005 by Solodov, Varnavskaya, Khvatova, Fakhrutdinov, Lebedev, Diyarov. 相似文献
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V. P. Smagin T. G. Vovk O. A. Varnavskaya E. V. Yudina 《Russian Journal of Inorganic Chemistry》2012,57(3):367-372
Complexation of europium(III) with 2,2′-dipyridyl in Eu(An)3-2,2′-dipyridyl-ethyl acetate systems, where An is acetylacetonate, trichloroacetate, or trifluoroacetate ions, was studied
by spectrophotometric methods. The stability constants of the complexes at different temperatures were determined, and Gibbs
energy, enthalpy, and entropy changes in complexation were calculated. The influence of the initial organic ligands on complexation
was elucidated. 相似文献
10.
Fakhrutdinov B. R. Varnavskaya O. A. Khvatova L. K. Lebedev N. A. Diyarov I. N. Fakhrutdinov R. Z. 《Russian Journal of Applied Chemistry》2001,74(8):1418-1421
The surface activity of block copolymers of ethylene and propylene oxides, based on ethylenediamine, mono(ethylene glycol), and triethanolamine, was studied. Adsorption characteristics of the investigated compounds at the water-air interface are estimated. 相似文献