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排序方式: 共有513条查询结果,搜索用时 46 毫秒
1.
Borodkin G. I. Popov S. A. Pokrovskii L. M. Shubin V. G. 《Russian Journal of Organic Chemistry》2003,39(5):747-749
Russian Journal of Organic Chemistry - 相似文献
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P. V. Snytnikov K. V. Yusenko S. V. Korenev Yu. V. Shubin V. A. Sobyanin 《Kinetics and Catalysis》2007,48(2):276-281
The performance of a Co-Pt powder and of Co-Pt catalysts supported on γ-Al2O3 and on the graphite-like carbon material Sibunit in selective CO oxidation in hydrogen-containing mixtures is considered. Fine particles of metal-metal solid solutions and intermetallides were obtained by the decomposition of a Co- and Pt-containing double complex salt in a hydrogen atmosphere at ~400°C. As compared to their Pt and Co monometallic counterparts, the bimetallic catalysts are more active and allow the CO concentration in hydrogen-containing mixtures to be reduced from 1 to 10?3 vol %. This effect is likely due to the formation of bimetallic particles of a Co-Pt solid solution on the support surface. 相似文献
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A. M. Genaev G. E. Sal’nikov V. G. Shubin 《Russian Journal of Organic Chemistry》2007,43(8):1134-1138
By DFT method energy barriers were calculated for carousel rearrangements of bicyclo[3.1.0]hexenyl, cyclobutenyl, and homotropylium cations. A plausible agreement between calculated and experimental findings was found. 相似文献
7.
A. A. Altynnikov O. V. Kalinkina V. F. Anufrienko A. A. Shubin S. V. Vossel V. V. Zakharov N. N. Bulgakov 《Reaction Kinetics and Catalysis Letters》1994,52(2):261-267
The ESR spectrum of exchange-coupled Ti3+ ions of gge has been observed in dissolution products of metallic titanium in HCl, evidencing the formation of chloride clusters of mutually ordered Ti3+ ions in dz2-ground state in distorted tetrahedral coordination. The cooperative Jahn-Teller effect (CJTE) defines orbital ordering of the d1 of Ti3+ ions in the cluster. 相似文献
8.
G. I. Borodkin I. R. Elanov R. V. Andreev M. M. Shakirov V. G. Shubin 《Russian Journal of Organic Chemistry》2006,42(3):406-411
The reaction of [2.2]paracyclophane with nitrosonium tetrachloroaluminate was studied by NMR (1H, 13C) spectroscopy using deuterium isotopic perturbation technique. The resulting cationic complexes containing one and two nitrosonium ions are involved in fast (on the NMR time scale) interconversion. Quantum-chemical calculations performed on the DFT level (using triple zeta basis set) indicate the higher stability of 2η single-charged π-complexes relative to σ complexes corresponding to the addition of NO+ ion at the ipso and ortho positions. The formation of the single-charged π-complex is energetically more favorable, compared to the double-charged π-complex. The affinity of NO+ for [2.2]paracyclophane is much greater than for p-xylene, presumably due to stacking interaction between the aromatic rings in the π-complex. 相似文献
9.
离子选择电极—流动注射分析法动力学测定葡萄糖存在下的果糖 总被引:3,自引:0,他引:3
本文将离子电极与流动注射分析相结合,利用30℃下,在强碱性介质中,果糖和葡萄糖与2,4-二硝基酚钠反应速度明显差异,动力学测定了葡萄糖存在下果糖的含量。自制了2,4-二硝基酚电极作为动力学电位测定用的工作电极。本法测定果糖的范围为0.02~1.00mol/L,其RSD为4.0%~4.9%,RE为1.0~5.0%;当C葡/C果≤3倍时,葡萄糖的干扰不超过5%;本法也曾成功地用于果葡萄浆测定,其RSD 相似文献
10.
R. S. Mitchenko A. A. Shubin T. V. Krasnyakova 《Theoretical and Experimental Chemistry》2006,42(5):314-319
A heterogeneous catalyst for the hydrochlorination of acetylene by gaseous HCl is formed as a result of mechanical treatment
of the solid salt K2PtCl4 in an atmosphere of acetylene, ethylene, or propylene by the formation of π complexes of platinum(II) as active centers in
the surface layer under these conditions. The controlling stage of the catalytic reaction is chloroplatination of the π-coordinated
acetylene by the HCl molecule. The reaction takes place as a concerted process, in which an intermediate β-chlorovinyl derivative
of platinum(II), a complex of platinum with a coordination vacancy[PtCl
3
*
]−, and a new molecule of HCl are formed simultaneously with cleavage of the H—Cl and Pt—Cl bonds in the metal complex adjacent
to the π-acetylene complex. The catalytic cycle closes with rapid dissociation of the organoplatinum intermediate by the action
of HCl, giving the final product and the initial complex [PtCl4]2−.
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Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 5, pp. 306–311, September–October, 2006. 相似文献