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1.
Gosteva Alevtina N. Plyusnin Pavel E. Semushina Yulya P. Pechenyuk Sofiya I. Filatov Evgeny Yu. Kyrtova Olga Yu. 《Journal of Thermal Analysis and Calorimetry》2018,134(1):253-260
Journal of Thermal Analysis and Calorimetry - The thermal behavior of double complex compounds (DCC) [Cr(ur)6][Co(CN)6]·4H2O (I), [Cr(ur)6][Co(C2O4)3]·3.5H2O (II),... 相似文献
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Colloid Journal - An Erratum to this paper has been published: https://doi.org/10.1134/S1061933X21330012 相似文献
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K.?Pajuste M.?Gosteva D.?Kaldre M.?Plotniece B.?Cekavicus A.?Sobolev A.?Priksane G.?Tirzitis G.?Duburs A.?PlotnieceEmail author 《Chemistry of Heterocyclic Compounds》2011,47(5):597-601
The effect of the solvent nature and temperature on the quaternization of 3,5-diethoxycarbonyl-2,6-di- methyl-4-(3-pyridyl)-1,4-dihydropyridine
by lipophilic alkyl bromides has been investigated. By comparison of the solvent effect (acetone, acetonitrile, and 2-butanone)
on the alkylation of the pyridine fragment of 3,5-diethoxycarbonyl-2,6-dimethyl-4-(3-pyridyl)-1,4-dihydropyridine it was established
that conducting the reaction in acetonitrile at 81 °C is the most optimal. 相似文献
4.
S. I. Pechenyuk D. P. Domonov A. N. Gosteva G. I. Kadyrova V. T. Kalinnikov 《Russian Journal of Coordination Chemistry》2012,38(9):596-603
Binary complex salts, [Co(En)3][Fe(CN)6] · 2H2O and [Co(En)3]4[Fe(CN)6]3 · 15H2O, are synthesized. The properties of the salts and their thermolysis in air, dihydrogen, and argon are studied. Oxides of the central ions of the binary complex salts are found to be the thermolysis products in an oxidative atmosphere. Solid solutions (intermetallic compounds) CoFe are the thermolysis products in the reductive atmosphere, whereas intermetallides containing considerable amounts of C and N and an impurity of Co and Fe oxides are the thermolysis products in an inert atmosphere. Gaseous thermolysis products in dihydrogen and argon are NH3, hydrocarbons, and ethylenediamine. 相似文献
5.
D. P. Domonov S. I. Pechenyuk A. N. Gosteva 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(6):913-918
Samples are obtained via the thermolysis of binary complex compounds in a hydrogen atmosphere. Their catalytic activity in hydrogen peroxide decomposition is studied. The values of the rate constants and activation energies for the catalytic reaction are estimated. The correlation between catalytic activity, composition, specific surface area (S sp), and particle size of the samples is analyzed. 相似文献
6.
Nikita Tsvetov Elena Pasichnik Anna Korovkina Alevtina Gosteva 《Molecules (Basel, Switzerland)》2022,27(13)
Chamaenerion angustifolium (L.) Scop. (fireweed) is a perennial herbaceous plant of the Onagraceae family widely used in folk and scientific medicine. It is a promising source of bioactive components. One of the modern trends in extraction is the use of natural deep eutectic solvents (NADESs) combined with ultrasound-assisted extraction (UAE). However, works devoted to the extraction of biologically active substances from C. angustifolium using NADESs are scarce. The aim of this work is a comprehensive study of UAE of bioactive components from C. angustifolium using NADESs based on choline chloride and malonic, malic, tartaric, and citric acids. The antioxidative properties, total phenols, and flavonoids content were estimated for NADES-based extracts. The reference solvents were water and 90% v/v ethanol. Volatile extracted components were identified using GC-MS. The kinetics of the UAE were studied at 45 °C for 20–180 min with water added to 30 wt% NADES. The power of the ultrasound was 120 W, and the frequency was 40 kHz. It was found that NADES choline chloride + citric acid is more effective for the extraction of bioactive components. For this, NADES UAE conditions were optimized following a Box–Behnken design of the experiment and a response surface methodology. The temperature ranged from 30 to 60 °C, the time of extraction ranged from 20 to 60, and the addition of water ranged from 30 to 70 wt%. We established the optimal extraction conditions: temperature 58 °C, time of extraction 35 min, and 70 wt% water. The obtained results expand the knowledge about the use of NADES for the extraction of biologically active compounds from cheap and available plant raw materials. 相似文献
7.
Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 1, pp. 89–97, January–February, 1990. 相似文献
8.
Filatov Evgeny Yu Semushina Yulya P. Gosteva Alevtina N. 《Journal of Thermal Analysis and Calorimetry》2018,133(1):355-364
Journal of Thermal Analysis and Calorimetry - In the current study, K-zeolites with different structure, Si/Al ratio and morphology have been prepared and then characterized by different techniques... 相似文献
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10.
In this paper we consider the uniform approximation of a function from a certain class by sums obtained as a result of some
matrix transformation of the universal power lacunary series. 相似文献