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排序方式: 共有656条查询结果,搜索用时 31 毫秒
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S. V. Usachev A. S. Osipov G. I. Kostrykina T. I. Irkhina N. B. Tantsova E. G. Fedorova 《Russian Journal of Applied Chemistry》2006,79(11):1890-1895
Variation of the molecular structure characteristics and properties of natural and 1,4-cis-polybutadiene rubbers (gel content, molecular weight, degree of branching of macromolecules, viscosity) in the course of their separate and joint mastication in the presence of dibenzoylaminodiphenyl sulfide as mastication accelerator or without it was studied. 相似文献
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Tikhova V. D. Shakirov M. M. Fadeeva V. P. Dergacheva M. I. Samutenko L. V. Fedorova L. V. 《Russian Journal of Applied Chemistry》2002,75(5):829-833
Quantitative and qualitative changes in humic acids of meadow soddy soils, occurring under the action of various fertilizer systems, were studied by 13C and 31P NMR. 相似文献
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Yu. V. Fedorov O. A. Fedorova N. E. Shepel’ S. P. Gromov M. V. Alfimov L. G. Kuz’mina J. A. K. Howard J. Saltiel 《Russian Chemical Bulletin》2005,54(9):2119-2128
Benzobisthiazole-based bis(crown ether) was synthesized and its complexation with alkali and alkaline earth cations was studied.
Photochemical transformations of the free ligand and its complexes with alkaline earth cations involve E,Z-photoisomerization and [2+2] photocycloaddition.
Dedicated to Academician N. S. Zefirov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2056–2065, September, 2005. 相似文献
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E. V. Tulyakova O. A. Fedorova Yu. V. Fedorov G. Jonusauskas A. V. Anisimov 《Russian Chemical Bulletin》2007,56(11):2166-2174
Using 1H NMR spectroscopy and steady-state and time-resolved electronic spectroscopy, the optical properties of mono-and bis(styryl)pyridinium
perchlorates and their complexes with Mg2+, Ba2+ cations were studied. The stability constants of the complexes were determined using spectrophotometric titration. The formation
of inclusion complexes for Mg2+ and sandwich type complexes for Ba2+ results in fluorescence enhancement and increases the lifetimes of the excited states of the initial bis-styryl ligands.
The variation of position of the styryl fragment in the pyridinium aromatic ring gives rise to photochromic crown ethers with
different optical and photophysical characteristics and is also an easy route to bis(crown-ethers) of symmetrical and unsymmetrical
structure.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2092–2100, November, 2007. 相似文献
9.
M. V. Alfimov S. P. Gromov O. B. Stanislavskii E. N. Ushakov O. A. Fedorova 《Russian Chemical Bulletin》1993,42(8):1385-1389
Styryl dyes containing a crown ether group and a heteroaromatic moiety with a sulfoalkylN-substituent (1a,b) undergo photocyclodimerization in acetonitrile in the presence of Mg(ClO4)2 to give only the typeA isomer of cyclobutane derivative (2a,b). The photochemical regio- and stereoselectivity of the cycloaddition is explained by self-organization of thetrans-isomers of the styryl dyes upon complexation with the Mg2+ cations into dimers with a fixed mutual arrangement of multiple bonds.For part 7, see ref. 1.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1449–1452, August, 1993. 相似文献
10.
E. A. Fedorova N. V. Glushkova M. N. Bochkarev H. Schumann H. Hemling 《Russian Chemical Bulletin》1996,45(8):1996-1999
Reactions of naphthaleneeuropium and naphthaleneytterbium, C10H8Ln(DME) (Ln = Eu or Yb), with phenylacetylene are accompanied by the formation of the C-C bond and yield the complexes of composition Ph2C4H2Ln(DME)2. Hydrolysis of the Ph2C4H2Ln(DME)2 complexes affords a mixture of isomers of 1,4-diphenyl-1,3-butadiene. Reactions of C10H8[LnI(DME)2]2 with PhCCH yield mixed iodine-ethynyl complexes [ILn(-CCPh)(DME)2]2. According to the data of X-ray diffraction analysis, the ytterbium complex consists of two YbI(DME)2 units bonded through two bridging CCPh groups. The crystals of this complex belong to the space groupP21/c. The central cyclic Yb-C-Yb-C fragment is planar; the C(I)-Yb(I)-C(I) angle is 86.4(3)°. The Yb-C bond lengths are 2.584(8) and 2.603(9) Å.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 2101–2104, August, 1996. 相似文献