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排序方式: 共有63条查询结果,搜索用时 218 毫秒
1.
S. N. Pod’‘yachev S. V. Bukharov I. A. Litvinov V. I. Morozov A. T. Gubaidullin G. N. Nugumanova N. A. Mukmeneva 《Russian Journal of General Chemistry》2004,74(11):1651-1657
Copper(II) 3-(3,5-di-tert-butyl-4-hydroxybenzyl)acetylacetonate was prepared, and its molecular and crystal structure were determined by single crystal X-ray diffraction. There are two crystallographically independent molecules of the complex in the crystal. In the first molecule, the square planar coordination of Cu(II) is virtually ideal, and in the second molecule it is somewhat distorted. On the whole, the conformations of the independent molecules are similar. The ESR spectrum of the polycrystalline complex suggests magnetic coupling of the Cu atoms and magnetic ordering. In solution in coordination-inert toluene, heating increases the contribution of tetrahedral distortions. In ethanol, the solvent molecule additionally coordinates at the axial positions of the complex.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 11, 2004, pp. 1775–1781.Original Russian Text Copyright © 2004 by Podyachev, Bukharov, Litvinov, Morozov, Gubaidullin, Nugumanova, Mukmeneva.This revised version was published online in April 2005 with a corrected cover date. 相似文献
2.
Grzegorz Schroeder Bogumi
Brzezinski Dariusz Pod
bski Eugeniusz Grech 《Journal of Molecular Structure》1997,416(1-3):11-19
Deprotonation of 5,10,15,20-tetrakis(pentafluorophenyl)-21-H, 23-H-porphyrin (PhF5PorH2) by various bases has been studied by 1H NMR and kinetic methods. The kinetic parameters in acetonitrile were defined for proton transfer reactions yielding [NH]+ protonated bases and [NHN]− anions with intramolecular hydrogen-bonded chains. 相似文献
3.
Istvn Hermecz Benjaminnyi Pod Zoltn Mszros Gyrgy Szsz Jzsef Kksi 《Journal of heterocyclic chemistry》1985,22(5):1373-1375
Fischer indolization of 6-arylhydrazono-6,7,8,9-tetahydro-11H-pyrido[2,1-b]quinazolin-11-ones 1 afforded substituted 7,8-dihydro-5H,13H-indolo[2′,3′:3,4]pyrido[2,1-b]quinazolin-5-ones 3-12 in high yields. 相似文献
4.
R. R. Sharipova O. A. Lodochnikova I. Yu. Strobykina R. Z. Musin V. M. Babaev V. I. Morozov S. N. Pod“yachev R. V. Chestnova V. E. Kataev 《Russian Chemical Bulletin》2013,62(1):175-182
New nitrogen-containing derivatives of the diterpenoid isosteviol (16-oxo-ent-beyeran-19-oic acid) containing oxo, hydroxyimine, and thiosemicarbazone groups were synthesized. Isosteviol 15-oxo-16-thiosemicarbazone forms a 1: 1 complex with CuII and inhibits the growth of Mycobacterium tuberculosis (H37RV, in vitro) at the minimum inhibitory concentration of 20 μg mL?1. 相似文献
5.
6.
Yu. V. Korneeva A. A. Novakova A. M. Ob”edkov A. A. Zaitsev G. A. Domrachev 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(4):369-372
The structure and phase composition of a carbon nanomaterial obtained by the thermal decomposition of toluene-ferrocene mixtures are studied by Mössbauer spectroscopy, high-resolution electron microscopy, and x-ray diffraction. Variations in the structural state of the catalyst and in the quantitative yield of the nanomaterial are analyzed as functions of the synthesis time. 相似文献
7.
Attenuation of Stoneley waves and higher Lamb modes propagating along an irregular surface of a fluid-filled borehole is investigated. This problem generalizes the problem on the attenuation of Rayleigh waves by an irregular surface of an empty borehole [10]. The technique used to evaluate the attenuation coefficient is based on the perturbation method (surface irregularity heights are considered to be small in comparison with the wavelength) and the mean field method. As a result, an expression is obtained for the partial coefficients of the eigenmode attenuation due to the scattering of eigenmodes by the irregularities of the borehole walls into the same or other eigenmodes, as well as into the bulk longitudinal and transverse waves. The frequency-dependent behavior of the partial attenuation coefficients of both Stoneley waves and higher modes is analyzed against the ratio between the irregularity correlation length and the borehole radius for different correlation functions of irregularities. 相似文献
8.
9.
A. I. Parkhomenko S. P. Pod’yachev T. I. Privalov A. M. Shalagin 《Journal of Experimental and Theoretical Physics》1997,84(1):51-58
We examine a monochromatic absorption line in the velocity-nonselective excitation of atoms when the components of the hyperfine
stricture of the electronic ground states are optically pumped. We show that the absorption lines possess unusual substructures
for some values of the hyperfine splitting of the ground state (which exceed the Doppler absorption linewidth severalfold).
These substructures in the absorption spectrum are most apparent if the hyperfine structure of the excited electronic state
is taken into account. We calculate the absorption spectra of monochromatic light near the D
1 and D
2 lines of atomic rubidium 85,87Rb. With real hyperfine splitting taken into account, the D
1 and D
2 lines are modeled by 4-and 6-level diagrams, respectively. Finally, we show that atomic rubidium vapor can be successfully
used to observe the spectral features experimentally.
Zh. éksp. Teor. Fiz. 111, 93–106 (January 1997) 相似文献
10.