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L. G. Klapshina V. V. Semenov A. N. Kornev V. S. Rusakov O. I. Shchegolikhina A. A. Zhdanov G. A. Domrachev 《Russian Chemical Bulletin》1998,47(3):478-481
The photochemical interaction of polyphenylferrisiloxane with some oligoorganosilanes in benzene solutions has been studied by UV, IR, ESR, and Mössbauer spectroscopy. Silylene species formed during photolysis of oligoorganosilanes react with the high-spin iron(III) to reduce the latter to low-spin iron(II). The formation of the low-spin state of iron(II) was supported by measurements of the magnetic moments. The insertion of the silylene species into the polymer chain to form the Fe?Si bond occurs due to the photoreaction. 相似文献
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V. V. Semenov N. F. Cherepennikova L. G. Klapshina B. A. Bushuk S. B. Bushuk W. E. Douglas 《Russian Journal of Coordination Chemistry》2005,31(7):521-529
Fluorescence and fluorescence excitation spectra of phosphorus-containing organosilicon ligands O = PX2NHR (X = NMe2, OPh; R = CH2CH2CH2Si(Oet)3 and their Eu(III) complexes in acetonitrile solutions and in films are studied. In UV region (285–420 nm), bis(dimethylamido)triethoxysilylpropylamidophosphate (X = NMe2) and diphenyltriethoxysilylpropylamidophosphate (X = OPh) exhibit two emission bands, whose position and intensity depend on the nature of substituents at the phosphorus atom. The Eu complexes show the ligand and the cation luminescence. The emission bands of coordinated ligands are shifted to long-wave region. The cation luminescence appears as three or four bands due to f-f transitions from the excited 5
D
0 level to the lower 7
F
1–4 levels. The most intense transition is 5
D
0 → 7
F
2. The emission band in a region of 420 nm appears in solutions and films prepared from both pure ligands and their Eu(III) complexes. This band is due to luminescence of spatially crosslinked nanoparticles of sesquioxane structure. The intensity ratio of the Eu3+ emission bands changes when going from solutions to films, the emission intensity increases in a range of 420 nm. Films containing incorporated Er complexes with amidophosphates show intense luminescence of a matrix at 430 nm and a series of weak narrow bands due to the Er3+ cation at 550–700 nm.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 7, 2005, pp. 550–558.Original Russian Text Copyright © 2005 by Semenov, Cherepennikova, Klapshina, B. Bushuk, S. Bushuk, Douglas. 相似文献
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S. V. Klement’eva N. F. Cherepennikova V. V. Semenov A. I. Kirillov M. A. Lopatin O. V. Kuznetsova Yu. A. Kurskii A. A. Zaitsev L. G. Klapshina V. E. Duglas G. A. Domrachev 《Russian Chemical Bulletin》2007,56(11):2214-2224
A method for the synthesis of polyphosphosiloxane by the thermal condensation of an equimolar mixture of trimethyl phosphate
and (3-aminopropyl)triethoxysilane at 200 °C was developed. The reaction affords ethanol and polyphosphosiloxane-{Si(OEt)[(CH2)3NR1R2]-O-P(O)(OMe)-O}n-(R1 = H, Me; R2 = Me), whose composition and structure were confirmed by 1H, 13C, and 31P NMR spectroscopy, IR spectroscopy, and elemental analysis. The scheme of polymerization involving the intermediate formation
of methyl-and dimethylphosphoric acids and their condensation with ethoxysilanes was proposed. The calcination of the obtained
polyphosphosiloxane in vacuo at 350 °C results in the elimination of the amino groups and alkoxide substituents, and a spatially cross-linked polymer
is formed as an amorphous powder. Its further thermolysis at 600 and 1000 °C gives crystalline phosphosilicates Si5O(PO4)6 or SiP2O7. Their amorphous and crystalline samples were characterized by IR spectroscopy, X-ray diffraction analysis, and solid-state
13C and 31P spectroscopy.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2138–2148, November, 2007. 相似文献
5.
Polysiloxane based on hydroxyl-containing monomer. Preparation,properties and biomedical application
Lyubova T. S. Zakharycheva N. S. Zakharychev E. A. Lermontova S. A. Ladilina E. Yu. Klapshina L. G. 《Russian Chemical Bulletin》2019,68(5):1075-1080
Russian Chemical Bulletin - A method for synthesis of hyperbranched polysiloxane based on N-methyl-N-(2,3,4,5,6-pentahydroxyhexyl)-N’-(3-triethoxysilylpropyl)urea is proposed. In water, the... 相似文献
6.
S. B. Bushuk W. E. Douglas Ju. A. Kalvinkovskaya L. G. Klapshina A. N. Rubinov B. A. Bushuk A. P. Stupak 《Journal of fluorescence》2003,13(4):331-338
The spectroscopic characteristics of novel -conjugated polymers containing four-coordinated silicon, acetylene groups and either 1,4-biphenylene or 2,7-fluorene in the main chain were investigated by steady-state and picosecond laser spectroscopy. The spectral features of absorption, fluorescence excitation spectra, fluorescence lifetime, and fluorescence polarization were explained by the existence of two kinds of inhomogeneously broadened electronic states formed in the disordered polymeric chain. The dynamics of photoinduced absorption was measured in the 400–900 nm spectral range with picosecond time resolution. The long-wavelength band with max 710 nm was ascribed to excited-state absorption from higher-lying electronic states created in short polymeric segments with essential conformational distortion of the subunits. The short-wavelength band with max 580 nm and a shoulder at 500 nm was interpreted as photoinduced absorption from a lower-lying state arisen in more planar, longer -conjugated segments populated via direct excitation and energy migration between disordered segments of the polymeric chain. For the fluorene-containing polymer, the smaller Stokes shift and the greater degree of fluorescence polarization are consistent with more extensive electron delocalization along the backbone. 相似文献
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V. V. Semenov N. V. Zolotareva L. G. Klapshina Yu. A. Kurskii M. A. Lopatin G. A. Domrachev 《Russian Journal of General Chemistry》2009,79(9):1802-1810
New fuctionalized ligand 3-(3′-triethoxysilylpropylaminocarbonyl)pent-2-on-3-en-4-ol (EtO)3SiCH2·CH2CH2NHC(O)-C[C(O)CH3][=C(OH)CH3] (I) containing ketoenol and triethoxysilyl groups is synthesized from 3-triethoxysilylpropyl isocyanate (EtO)3SiCH2CH2CH2N=C=O and acetylacetone. The reaction is accompanied by the formation of 2-(3′-triethoxysilylpropylaminocarboxy)-pent-2-en-4-one
(EtO)3SiCH2CH2·CH2NHC(O)-OC(CH3)=CH-C(O)CH3 (II), the product of addition of acetylacetone enol form to isocyanate group. The ratio of amide I and urethane II forms is 7:3. Europium(III) tris[3-(3′-triethoxysilylpropylaminocarbonyl) pent-2-on-3-en-4-olate] is prepared from I and Eu(i-OPr)3. An alternative pathway consists in the reaction of europium tris(acetylacetonate) with 3-triethoxysilylpropyl isocyanate.
Conditions of formation of transparent europium-containing sol-gel films were developed. Thermal stability and photoluminescence
of the films were investigated. 相似文献
9.
Alexander V. Yakimansky Tamara K. Meleshko Dmitrii M. Ilgach Maria A. Bauman Tatiana D. Anan'eva Larisa G. Klapshina Svetlana A. Lermontova Irina V. Balalaeva William E. Douglas 《Journal of polymer science. Part A, Polymer chemistry》2013,51(20):4267-4281
An approach to the synthesis of new regular graft‐copolymers polyimide (PI)‐graft‐polymethacrylic acid is elaborated, including (1) synthesis of multicenter PI macroinitiators, (2) controlled ATRP of tert‐butylmethacrylate on the prepared macroinitiators, and (3) protonolysis of tert‐butyl ester groups of side chains of the resulting PI‐graft‐poly(tert‐butylmethacrylate). Experimental conditions for attaining complete conversions of the first and the third stages of the process are determined by means of 1H NMR and FTIR‐spectroscopy. Polymer products of the first and the second stages of the process, as well as poly(tert‐butylmethacrylate) side chains cleaved from the PI‐graft‐poly(tert‐butylmethacrylate) copolymers by complete decomposition of the PI backbone under alkaline hydrolysis conditions, are characterized by GPC. The kinetics of poly(tert‐butylmethacrylate) chain growth on a PI macroinitiator under ATRP conditions are studied. The results obtained provide evidence for the controlled character of the ATRP process and the regular structure of the synthesized graft‐copolymers. It is shown that PI‐g‐PMAA PI brushes are significantly more efficient intracellular delivery agents for the potential photosensitizer [tetra(4‐fluorophenyl)tetracyanoporhyrazine free base] than are the commonly used PEG‐micelles. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4267–4281 相似文献