排序方式: 共有45条查询结果,搜索用时 15 毫秒
41.
Igor L. Fedushkin Prof. Dr. Valentina A. Chudakova Alexandra A. Skatova Natalie M. Khvoinova Yuri A. Kurskii Tatyana A. Glukhova Georgy K. Fukin Sebastian Dechert Markus Hummert Herbert Schumann Prof. Dr. 《无机化学与普通化学杂志》2004,630(4):501-507
The new rigid bidentate nitrogen ligands 1, 2‐bis[(2, 5‐di‐tert‐butylphenyl)imino]acenaphthene ( 1 ) (dtb‐BIAN) and 1, 2‐bis[(2‐biphenyl)imino]acenaphthene ( 2 ) (bph‐BIAN) have been synthesized by condensation of 1, 2‐acenaphthylenedione with 2, 5‐di‐tert‐butylaniline and 2‐aminobiphenyl, respectively. Reduction of 1 and 2 with magnesium and calcium results in the formation of the monomeric metal complexes [(dtb‐BIAN)Mg(THF)2] ( 3 ), [(bph‐BIAN)Mg(DME)2] ( 4 ), and [(bph‐BIAN)Ca(THF)3] ( 5 ). Compounds 1 — 5 have been characterized by C/H analyses, IR, 1H NMR, and 13C NMR spectra, the structures of 2 , 3 , and 5 have been estimated by single crystal X‐ray diffraction. 相似文献
42.
O. V. Rudnitskaya E. K. Kultyshkina A. I. Stash A. A. Glukhova N. U. Venskovskiĭ 《Crystallography Reports》2008,53(4):608-612
The complex [(NH2)2CSSC(NH2)2]2[OsBr6]Br2 · 3H2O is synthesized by the reaction of K2OsBr6 with thiocarbamide in concentrated HBr and characterized using electronic absorption and IR absorption spectroscopy. Its crystal structure is determined by X-ray diffraction. The crystals are orthorhombic, a = 11.730(2) Å, b = 14.052(3) Å, c = 16.994(3) Å, space group Cmcm, and Z = 4. The [OsBr6]2? anionic complex has an octahedral structure. The Os-Br distances fall in the range 2.483–2.490 Å. The α,α′-dithiobisformamidinium cation is a product of the oxidation of thiocarbamide. The S-S and C-S distances are 2.016 and 1.784 Å, respectively. The H2O molecules, Br?ions, and NH2 groups of the cation are linked by hydrogen bonds. 相似文献
43.
The stability of C60 and C70 fullerenes and C60 and C72 nanotubes devoid of 2–12 atoms of the cluster skeleton was theoretically studied. It was established that Cn molecules with an even number of atoms remain stable, which was confirmed by experimental studies of monomolecular decay of clusters with the number of atoms n≥30. The change in the internuclear distances and in the ionization potential of nanoclusters was determined depending on the number of eliminated atoms. Such defects were shown to decrease the ionization potential of nanoclusters by 0.5–0.8 eV. The electron spectrum was calculated within the Harrison semiempirical tight-binding model in the Goodwin modification. A new parametrization of interatomic matrix elements of the Hamiltonian and atomic terms for carbon nanoclusters was suggested. 相似文献
44.
G. N. Ten O. E. Glukhova M. M. Slepchenkov I. I. Bobrinetskii R. A. Ibragimov G. E. Fedorov V. I. Baranov 《Optics and Spectroscopy》2016,120(5):732-739
A topological defect in a carbon nanotube grown by chemical vapor deposition from methane onto a silicon substrate with thermal oxide has been investigated and visualized (with a resolution of about 1.5 μm) by confocal Raman spectroscopy. Vibrational Raman spectra of molecular fragments of a single-wall carbon nanotube (SWCNT) without a defect and with Stone–Wales defects (two pentagonal and two heptagonal cells) are calculated. The influence of defects on the shape of G-band components (G+ and G–), which makes it possible to determine the nanotube conductivity type, is considered. 相似文献
45.
G. N. Ten O. E. Glukhova M. M. Slepchenkov V. I. Baranov 《Optics and Spectroscopy》2016,120(3):359-366
The electronic—vibrational fluorescence spectra of the first, S0 → 1Lb, and second, S0 → 1La, electronic transitions of 7-azaindole and its tautomer for an isolated state have been calculated. Specific features of structural changes in 7-azaindole and its tautomer upon electronic excitation are determined. Vibrational spectra are assigned for the ground state, and the vibrational structure of fluorescence spectra is interpreted. It is shown that the intensity redistribution between the 6a and 6b oscillations, which is observed in the fluorescence spectrum of the S0 → 1Lb transition in 7-azaindole, can be explained as a result of intensity borrowing (according to the Herzberg—Teller mechanism) from the 1La state. 相似文献