排序方式: 共有34条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
A. E. Lesnov A. V. Golovkina O. S. Kudryashova S. A. Denisova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(8):1587-1591
Phase equilibria in layering systems of water, polyethyleneglycol ethers of monoethanolamides of synthetic fatty acids (SFAs) (synthamide-5), and ammonium chloride are studied. The possibility of using such systems for the liquid extraction of metal ions is evaluated. The effect the nature of salting-out agents has on the processes of segregation of the systems has been considered. 相似文献
5.
6.
The propagation of electromagnetic waves in type-II superconductor-insulator periodic structures is studied for the case when the superconductor falls into the nonlinearity range of the dynamic mixed state described in the framework of the Larkin-Ovchinnikov theory. A dispersion relation for waves propagating in different directions is derived. It is shown that the electromagnetic waves can be amplified via interaction with a moving lattice of Abrikosov vortexes. 相似文献
7.
Khlebnikov AF Novikov MS Golovkina MV Petrovskii PP Konev AS Yufit DS Stoeckli-Evans H 《Organic & biomolecular chemistry》2011,9(10):3886-3895
An effective approach to azepino-fused heterocycles is described. trans-1-Aryl-7,11b-dihydro-1H-azirino[1,2-a]dibenzo[c,f]azepines were synthesised via a domino sequence: isomerization of gem-dichloroaziridine-intramolecular Friedel-Crafts acylation of the tethered benzene ring catalysed by SnCl(4) and subsequent hydride induced intramolecular cyclization. Cycloaddition of dibenzazepinium ylides, generated by heating these aziridines, to activated C[double bond]C, C[triple bond]C dipolarophiles and fullerene C(60), leads to derivatives of dibenzo[c,f]pyrrolo[1,2-a]azepine. The reaction proceeds with complete stereoselectivity via cycloaddition of only W-ylide, which due to the high barrier does not undergo E,Z-isomerization under the reaction conditions. It was found that 2,3,9,13b-tetrahydro-1H-dibenzo[c,f]pyrrolo[1,2-a]azepine systems can exist in conformations of two types depending on the substituents at the pyrrolidine carbons in β-position with respect to nitrogen. Details of cycloaddition reactions and the conformational behavior of cycloadducts were studied by DFT calculations at the B3LYP/6-31G(d) level. 相似文献
8.
L. S. Molochnikov E. G. Kovaleva E. L. Golovkina I. A. Kirilyuk I. A. Grigor’ev 《Colloid Journal》2007,69(6):769-776
Acidic characteristics of various inorganic materials, such as silica gel, aluminum, and titanium(IV) oxides, original and modified with F? and SO 4 2? ions, in the form of hydrogels and nanostructured powders doped by copper(II) ions, are studied. It is shown that pH values inside pores of the studied sorbents (pHintr) differ from the pH of external solutions by 0.5–1.1 units. In the pores of original γ-Al2O3, the pHintr values are higher, while, in pores of γ-Al2O3 samples modified with F? и SO 4 2? , as well as nonmodified α-Al2O3, SiO2 gel, and TiO2 hydrogels, pHintr are lower compared to the pH of the external solution. It is found that pHintr decreases, as the content of Cu2+ ions in the TiO2 phase grows, and, beginning with a certain moment, it coincides with pH of an equilibrium solution. The pK a values of functional group dissociation in some materials are determined. It is shown that, using spin probes, that is, pH-sensitive nitroxyl radicals, the electrostatic potential of the surface of nanostructured TiO2 can be estimated. 相似文献
9.
L. S. Golovkina N. S. Vorob'eva Z. K. Zemskova Al. A. Petrov 《Russian Chemical Bulletin》1990,39(7):1402-1405
The structures of completely hydrogenated and aromatized products of the reaction of bicyclo[2.2.2]octene and 1,3-cyclohexadiene were investigated by mass spectrometry. It is shown that the reaction proceeds via mechanisms of the linear polymerization type and the Diels-Alder polymerization type; hydrocarbons, the molecules of which include bridged, condensed, interlinked, and mixed types of ring fusion, are formed.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1549–1553, July, 1990. 相似文献
10.