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991.
1,1,2,2-Tetramethyl-3-trimethylsilyl-1,2-disilacyclobutane: synthesis and spontaneous polymerization
L. E. Gusel’nikov V. V. Volkova E. N. Buravtseva N. V. Ushakov V. G. Lakhtin L. A. Parshkova E. A. Chernyshev 《Russian Chemical Bulletin》2013,62(6):1462-1464
Gas-phase dehalogenation of 1,2-bis[chloro(dimethyl)silyl]-2-trimethylsilylethane with alkali metals gave 1,1,2,2-tetramethyl-3-trimethylsilyl-1,2-disilacyclobutane (3). Its spontaneous ring-opening polymerization at room temperature afforded an amorphous linear polymer with T g = ?8.9°C, M w = 3.47·105–3.85·105, and M w /M n = 2.43—2.86. According to spectroscopic data (IR and 1H, 13C, and 29Si NMR), the backbone of the polymer consists of alternating monomer units joined in the “head-to-tail” ([Me2SiCH(SiMe3)CH2SiMe2SiMe2CH-(SiMe3)CH2SiMe2]) and “head-to-head” ways ([Me2SiCH2CH(SiMe3)SiMe2SiMe2CH-(SiMe3)CH2SiMe2]). 相似文献
992.
R. M. Islamova O. I. Ishkinina S. V. Nazarova O. N. Chupakhin I. A. Utepova N. M. Andriyashina A. O. Terent’ev 《Russian Chemical Bulletin》2013,62(5):1282-1285
Cyclic peroxides as initiators for the radical polymerization of methyl methacrylate were proposed. The initial rates, initiation rates, and effective activation energies of polymerization initiated by cyclic peroxides and cyclic peroxide-1-pyridyl-2-ferrocene systems were determined. The radical yields to the volume upon the thermal decomposition of cyclic peroxides and their catalytic decomposition in the presence of 1-pyridyl-2-ferrocene were determined. In combination with 1-pyridyl-2-ferrocene cyclic peroxides form efficient initiating systems favoring an increase in the polymerization rate, a decrease in the molecular weights, and an increase in syndiotacticity of the synthesized poly(methyl methacrylate). 相似文献
993.
I. A. Khotina A. I. Kovalev N. S. Kushakova M. A. Babushkina Yu. V. Vasil’ev A. S. Peregudov 《Russian Chemical Bulletin》2013,62(10):2234-2244
A series of model cyclotrimers was studied by NMR spectroscopy using 2D COSY, HSQC, and HMBC correlations to establish the structures of branched oligophenylenes, whose branching center is the 1,3,5-triphenyl-substituted benzene ring. 相似文献
994.
E. V. Shchegol’kov Ya. V. Burgart V. I. Saloutin O. N. Chupakhin 《Russian Chemical Bulletin》2013,62(1):220-222
Fluorinated 2-amino-5-phenyl-1,3,4-thiadiazines were obtained for the first time. A study of their tautomeric structures revealed that trifluoromethyl-containing 1,3,4-thiadiazines exist as the 4H-tautomer in both solutions and the solid state, while their monofluoroaryl analogs exist as the 6H-tautomer. 相似文献
995.
A. G. Medvedev A. A. Mikhailov P. V. Prikhodchenko T. A. Tripol’skaya O. Lev A. V. Churakov 《Russian Chemical Bulletin》2013,62(8):1871-1876
The crystal structures of new peroxosolvates of the following pyridinemonocarboxylic acids were studied: picolinic 2-C5H4NCOOH·H2O2 (1), nicotinic 3-C5H4NCOOH·H2O2 (2), and isonicotinic 4-C5H4NCOOH·2H2O2 (3). In these compounds, the acids exist exclusively as zwitterions, as opposed to non-solvated crystals. In compounds 1–3, the hydrogen peroxide molecules form two donor hydrogen bonds and, in some cases, one additional acceptor hydrogen bond. Peroxosolvate 2 can be considered as a novel drug formulation of vitamin B3. 相似文献
996.
I. S. Vasil’chenko I. G. Borodkina A. S. Burlov N. V. Karpova G. M. Abakarov K. A. Lyssenko G. S. Borodkin I. E. Uflyand A. D. Garnovskii V. I. Minkin 《Russian Chemical Bulletin》2013,62(8):1809-1814
Bis-imines of 2,2′-diaminodiphenylditelluride and 2-tosylamino (9a) and 2-hydroxybenzaldehyde (9b) were prepared and studied by X-ray diffraction, heteronuclear (1H, 13C, 15N, and 125Te) magnetic resonance, and quantum chemical calculations (Pbe1pbe/DGDZVP). According to the X-ray diffraction data, compound 9b in the crystal phase has nonsymmetrical structure: one of the tellurium atoms forms hypervalent bonding with the adjacent oxygen atom, while the second one is not involved in such interaction. The NMR study showed the symmetric molecular structure of imines 9a,b in DMSO-d6 with the tellurium atoms interacting hypervalently with the C=N nitrogen atoms. 相似文献
997.
T. S. Zyubina A. S. Zyubin Yu. A. Dobrovol’skii V. M. Volokhov 《Russian Chemical Bulletin》2013,62(2):363-373
In the framework of investigation of active and stable electrocatalysts for fuel cells, the hydrogen migration by relay with the consecutive formation of H2O molecules in the O2/Pt19/SnO2/H2·nH2O → O/Pt19/SnO2·nH2O + H2O system was simulated. The simulations were performed by the density functional theory (DFT) method with the generalized gradient adjustment (GGA=PBE) under periodic boundary conditions in the projector augmented plane wave (PAW) basis set with a pseudo-potential using the VASP program package. At the cathode on the platinum cluster surface, the oxygen molecules without a barrier form peroxide complexes that dissociate with an energy decrease. The protons transferred via the proton-conducting channels from the anode to cathode form first OH groups bound to the platinum cluster and then H2O molecules that are easily separated from the cluster (~0.2 eV). The proton transfer process proceeds by relay and involves several water molecules. 相似文献
998.
A. N. Gusev V. F. Shul’gin G. A. Nishchimenko S. B. Meshkova A. V. Kiriyak G. G. Aleksandrov I. L. Eremenko 《Russian Journal of Coordination Chemistry》2013,39(6):432-436
Heteroligand coordination compounds Ln(Dbm)2HL · nEtOH, where Ln is Nd(III), Yb(III), and Er(III); HDbm is dibenzoylmethane; H2L is bis(5-pyridin-2-yl-1,2,4-triazol-3-yl)methane, are synthesized and studied. The complexes are studied by elemental analysis, TGA, and IR spectroscopy. The structure of complex [Nd(Dbm)2 · HL · EtOH] · EtOH is determined by X-ray diffraction analysis. The crystals are triclinic, space group $P\bar 1$ , a = 10.2004(9), b = 11.3809(10), c = 20.9173(18) Å, α = 102.133(1)°, β = 103.568(1)°, γ = 100.306(2)°; Z = 2 (8416 reflections with I > 2σ(I), R = 0.053, Rw = 0.136). The luminescence of solid samples of the studied complexes is studied in the near-IR region. 相似文献
999.
S. V. Fokin E. T. Kostina E. V. Tret’yakov G. V. Romanenko A. S. Bogomyakov R. Z. Sagdeev V. I. Ovcharenko 《Russian Chemical Bulletin》2013,62(3):661-671
The synthesis, structure, and magnetic properties of the products of the reaction for Cu(hfac)2 (hfac is hexafluoroacetylacetonate) with spin-labeled nitronyl nitroxides 4,4,5,5-tetramethyl-2-(1-R-1H-pyrazol-5-yl)-3-imidazoline-1-oxyl 3-oxides L5/R (R = Me, Et, Pr, Bu), viz., binuclear complex [Cu(hfac)2L5/Me]2 and chain polymer complexes [Cu(hfac)2L5/R]n, are described. The polymer heterospin chains are built according to “head-to-head” (R = Me, Et, Pr, Bu) and “head-to-tail” (R = Pr, Bu) motifs. Compound [Cu(hfac)2L5/Me]2 is characterized by the ability to reveal the reversible effect of thermally induced spin transition at a temperature about 75 K (without hysteresis). In the set of heterospin CuII compounds with spin-labeled pyrazoles, this is the earlier unknown example of a molecular complex exhibiting a similar magnetic anomaly. 相似文献
1000.
A. M. Suleimanova N. G. Grigor’eva S. V. Bubennov A. F. Gizetdinova M. I. Tselyutina B. I. Kutepov 《Russian Chemical Bulletin》2013,62(2):435-437
The high catalytic activity and selectivity of zeolites HBeta and HZSM-12 were found in the synthesis of (E)-4-phenyl-3-buten-2-one by the reaction of styrene with acetic anhydride. 相似文献