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81.
I. Ya. Zaitseva I. S. Kovaleva V. A. Fedorov 《Russian Journal of Inorganic Chemistry》2009,54(6):840-841
CsZn2Br5 crystals are studied by X-ray diffraction. The compound crystallizes in the monoclinic system with the unit cell parameters a = 6.8880(12) Å, b = 10.4703(19) Å, c = 6.5197(9) Å, β = 108.25°, V = 446.55 Å3, ρcalcd = 4.960 g/cm3. Refractive indices are n p = 1.640 and n p = 1.754. 相似文献
82.
E. Kh. Lermontova A. V. Churakov M. Quan Yu. F. Oprunenko S. S. Karlov G. S. Zaitseva 《Russian Journal of Inorganic Chemistry》2009,54(2):211-218
The reaction of dialkanolamines RN(CH2CH2O)(CHR’CHR’OH) (R = Me, Ph, PhCH2; R’ = H, Ph) with tetraethoxygermane gives either 2,2-diethoxy-1,3,6,2-dioxazagermocanes RN(CH2CH2O)(CHR’CHR’O)Ge(OEt)2 or 1,7,9,15-tetraoxa-4,12-diaza-8-germaspiro[7.7]pentadecanes [RN(CH2CH2O) (CHR’CHR’O)]2Ge depending on the reactant ratio. The chemical behavior of the obtained compounds in substitution reactions at germanium was studied. The product structure was confirmed by elemental analysis data and 1H, 13C, and 19F NMR spectroscopy. The cyclotrigermanoxane [MeN(CH2CH2O)2GeO]3 was studied by X-ray diffraction. 相似文献
83.
Alla B. Antonova Michael I. Bruce Paul A. Humphrey Brian K. Nicholson Brian W. Skelton Natasha N. Zaitseva 《Journal of organometallic chemistry》2006,691(22):4694-4707
A series of alkynyl-tricobalt carbonyl clusters, Co3(μ3-CnR)(μ-dppm)(CO)7 [R = But, Ph, C6H4I, C6H4CCPh, SiMe3, Fc, Au(PPh3)] containing three, five or seven carbons in the chain, have been prepared by elimination of phosphine-gold(I) halides in reactions between Co3(μ3-CBr)(μ-dppm)(CO)7 and Au(CCR)(PPh3) or between Co3{μ3-CCCAu(PR3)} (μ-dppm)(CO)7 (R = Ph, tol) and ICCR′ (R′ = SiMe3, Fc). The use of poly-substituted arenes or ferrocenes has enabled preparation of the complexes 1,4-{(OC)7(μ-dppm)Co3 (μ3-CCC)}2C6H3X-5 (X = H, Br), 1,3,5-{(OC)7(μ-dppm)Co3(μ3-CCC)}3C6H3 and 1,1′-{(OC)7(μ-dppm)Co3 (μ3-CCC)}2Fc′ [Fc′ = Fe(η-C5H4-)2]. The X-ray determined molecular structures of 12 of the complexes are reported. 相似文献
84.
Girichev GV Giricheva NI Haaland A Kuzmina NP Samdal S Strenalyuk TN Tverdova NV Zaitseva IG 《Inorganic chemistry》2006,45(13):5179-5186
The molecular structures of tris(dipivaloylmethanato)neodymium(III), Nd(dpm)3, and tris(dipivaloylmethanato)ytterbium(III), Yb(dpm)3, have been determined by gas electron diffraction (GED) and structure optimizations through density functional theory (DFT) calculations. Both molecules were found to have D3 molecular symmetry. The most important structure parameters (r(a) structure) are as follows (GED/DFT): Nd-O = 2.322(5)/2.383 A, Yb-O = 2.208(5)/2.243 A, O-Nb-O = 72.1(3)/71.3 degrees , and O-Yb-O = 75.3(2)/75.8 degrees . The twist angles of the LnO6 coordination polyhedron, defined as zero for prismatic and 30 degrees for antiprismatic coordination, were theta = 19.1(3)/14.2 degrees for Nd and 20.4(2)/19.2 degrees for Yb. Structure optimizations of La(dpm)3, Gd(dpm)3 Er(dpm)3, and Lu(dpm)3 by DFT also yielded equilibrium structures of D3 symmetry with bond distances of La-O = 2.438 A, Gd-O = 2.322 A, Er-O = 2.267 A, and Lu-O = 2.232 A. The Ln-O bond distances in 12 Ln(dpm)3 complexes studied by GED decrease in a nearly linear manner with the increasing atomic number (Z) of the metal atom, as do the Ln-O bond distances in the cubic modifications of 14 sesquioxides, Ln2O3. The bond distances in the dpm complexes are, however, about 2% shorter. The mean Ln-O bond rupture enthalpies of the cubic sesquioxides calculated from thermodynamic data in the literature vary in an irregular manner with the atomic number; the La-O, Gd-O, Tb-O, and Lu-O bonds are nearly equally strong, and the remaining bonds are significantly weaker. The Ln-O bond rupture enthalpies previously reported for 11 Ln(dpm)3 complexes are on the average 13 kJ mol(-1) or about 5% smaller than in the sesquioxides, but they vary in a similar manner along the series: it is suggested that the pattern reflects variations in the absolute enthalpies of the gaseous Ln atoms. 相似文献
85.
The results of acoustic investigations of solid solutions SrTiO3?BiFeO3 in the temperature range from 100 to 650 K have been presented. The measurements of the velocity and attenuation of the longitudinal ultrasonic mode at a frequency of 10 MHz were carried out by the pulse-echo method. The observed anomalies in velocity and attenuation correlate with the maxima of the dielectric constant in the temperature range of the relaxor state. In addition, the attenuation peaks in the temperature range 400–600 K, which define Burns and T* temperatures, which are characteristic of relaxors, have been identified. The obtained results have allowed the clarifying of the phase diagram of the solid solution system SrTiO3?BiFeO3. 相似文献
86.
Kurenkov V. F. Zaitseva O. A. Isaeva N. V. 《Russian Journal of Applied Chemistry》2001,74(10):1735-1739
The kinetics of radical copolymerization of magnesium and calcium 2-acrylamido-2-methylpropanesulfonates with N-vinylpyrrolidone in aqueous solutions at pH 9 and 50°C in the presence of an initiator, potassium peroxodisulfate, were studied dilatometrically, and the molecular characteristics of the resulting copolymers were determined. 相似文献
87.
Kurenkov V. F. Zaitseva O. A. Solov'ev D. A. 《Russian Journal of Applied Chemistry》2001,74(3):505-509
Kinetic features of homogeneous radical copolymerization of acrylamide with magnesium 2-acrylamido-2-methylpropanesulfonate in concentrated aqueous solutions in the presence of the initiating system potassium peroxosulfate-sodium hydrosulfite at pH 9 and 50°C were studied by dilatometric technique. 相似文献
88.
Natalia Zaitseva Leslie Carman Andrew Glenn Jason Newby Michelle Faust Sebastien Hamel Nerine Cherepy Stephen Payne 《Journal of Crystal Growth》2011,314(1):163-170
Single crystals of a pure hydrocarbon, 1,3,5-triphenylbenzene, with properties suitable for high-energy neutron detection were grown from toluene solutions using slow evaporation and temperature reduction methods with growth rates up to 10 mm/day. Application of the rapid growth technique developed earlier for growth of large water-soluble crystals shows that crystals of aromatic compounds can be successfully grown from solutions in large volumes required for their use as scintillator materials for radiation detection. 相似文献
89.
V. V. Vladimirsky V. K. Grigor’ev I. A. Erofeev O. N. Erofeeva A. P. Zaitseva Yu. V. Katinov I. Ya. Korol’kov V. I. Lisin V. N. Luzin V. N. Nozdrachev V. V. Sokolovsky G. D. Tikhomirov E. A. Fadeeva Yu. P. Shkurenko 《Physics of Atomic Nuclei》2006,69(10):1751-1758
The history of the development and construction of the ITEP-MIS 6-m magnetic spectrometer is reported. Research studies performed by the ITEP-MIS group over a period of more than 30 years of spectrometer existence is surveyed. The results obtained by studying the narrow resonances f j(2220) and X(1070) are presented. 相似文献
90.