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1.
Olga N. Pestova Andrey Yu. Efimov Lyubov A. Myund Andrei G. Kudrev Vasiliy D. Khripun Anna G. Davidian Valeria E. Baranauskaite 《Journal of solution chemistry》2017,46(9-10):1854-1870
A new approach has been proposed to study the structure of aqueous electrolyte solutions. NIR, Raman and attenuated total reflectance, Fourier transform infra-red (ATR FTIR) spectra have been measured for aqueous calcium perchlorate solutions in the 0.22–4.3 mol·L?1 (0.22–7.46 mol·kg?1) concentration range at 25 °C. By the methods of principal component analysis (PCA) and multivariate curve resolution—alternating least squares (MCR-ALS) the number, spectra and concentration profiles have been determined for spectroscopically distinguishable forms of water and ClO 4 ? ion in solutions. The results have been analyzed using a phenomenological model, establishing thereby: concentration ranges for structural rearrangements of the solution, the nature of structural microirregularities and different states of the ClO 4 ? ion in the areas of domination of the natural water structure, and of cybotactic groups of calcium perchlorate hexa and tetra hydrates. 相似文献
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From recent rate constant data for the recombination reaction 2CF3• → C2F6 ($
k_{(CF_3 )_2 }^M
$
k_{(CF_3 )_2 }^M
) in the high-pressure limit and from experimental data obtained at intermediate pressures of buffer gases M (M = He, Ar,
N2, CF3I), analytical expressions for $
k_{(CF_3 )_2 }^M
$
k_{(CF_3 )_2 }^M
(in Lindemann’s formulation) are derived for the temperature range of 300–1300 K and intermediate pressures of the buffer
gases. 相似文献
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G. A. Skorobogatov V. K. Khripun A. G. Rebrova 《Russian Journal of General Chemistry》2009,79(12):2641-2651
The fact was established that the pyrolysis of gaseous iodomethanes RI yields methane and non traces of recombination products
R2. A pyrolysis mechanism was proposed and rate constants of limiting stages of the pyrolysis of iodomethane, trideuteroiodomethane,
and diiodomethane over the range of 500–1500 K were determined. 相似文献
6.
Skorobogatov G. A. Meilakhs A. G. Pogosyan Yu. I. Khripun V. K. 《Russian Journal of General Chemistry》2002,72(8):1271-1275
It is found for the first time that photolysis of gaseous acetone under UV irradiation produces ethane not only via recombination of methyl radicals, but also by the mechanism of induced predissociation. 相似文献
7.
A. G. Davidian O. N. Pestova G. L. Starova V. V. Gurzhii L. A. Myund M. K. Khripun 《Russian Journal of General Chemistry》2012,82(4):621-625
Crystal structures of isomorphous crystal nonahydrates of aluminum, gallium, and scandium perchlorates were determined by the X-ray crystal analysis at room temperature. The estimate of associates present in concentrated solutions was carried out by the method of X-ray diffraction in aqueous solutions of aluminum perchlorate. 相似文献
8.
IR spectra of propylene glycol solutions in water were measured in the region of the first overtone of water. The inhibition
efficiency of calcium sulfate was determined as a function of the pH value and propylene glycol content of water. A concept
is suggested for taking into account the water-complexone interaction in inhibition of calcium sulfate crystallization with
phosphonic acids. 相似文献
9.
G. A. Skorobogatov A. D. Misharev A. G. Rebrova V. K. Khripun 《Russian Journal of General Chemistry》2005,75(9):1411-1420
Final products of isothermal pyrolysis of CF2HBr, CF2ClBr, CH3I, CH2I2, CHI3, i-C3F7I, and C4F9I were determined and mechanisms of their formation were proposed. The enthalpy of formation of the free biradical CFBr·· (ΔfH 0 0 = 80±20, Δ fH 0 298 = 60±20 kJ mol?1) was estimated. The dissociation energies ED, 0(ID2C-D), ED,298(ID2C-D), and ED,0(IH2C-D) equal to 437±6, 444±6, and 435±4 kJ mol?1, respectively, were determined. 相似文献
10.
Tunik SP Khripun VD Haukka M Pakkanen TA 《Dalton transactions (Cambridge, England : 2003)》2004,(11):1775-1782
Reactions between unsaturated [H(2)Os(3)(CO)(9)(PR(3))] clusters (PR(3)= PPh(3), P(4-CF(3)-C(6)H(4))(3), PEt(3)) and 2,4-hexadiyne-1,6-diol have been studied. It was found that the diyne ligand easily reacts with all these complexes to give [HOs(3)(CO)8(PR3)-[mu3, eta1:eta3:eta1)-(CH(3)-C-C=CH-CH=C-O)]] complexes (V, VI and VII, respectively) containing the "Os3C3" pentagonal pyramid cluster framework. This structural pattern is formed through the diyne cyclization, dissociation of a CO ligand and eventual coordination of the cyclized organic moiety to the osmium triangle in the [mu3, eta1:eta3:eta1) manner. In the case of the PEt(3) substituted cluster the second hydride transfer onto the organic fragment occurs to afford the nonhydride [Os(3)(CO)(8)(PR3)[mu3), eta1:eta2:eta1)-(CH(3)-CH-C=CH-CH=C-O)]] cluster, VIII, containing distorted pentagonal pyramid framework with a broken Os-C bond. Heating V, VI of VII and in hexane solutions results in formation of the regioisomers (Va, VIa and VIIa) with the phosphine ligand located at adjacent osmium atoms across the Os-Os bond bridged by the coordinated organic fragment. The most probable mechanism of the isomerization includes reversible phosphine migration between these metal centres. Solid-state structure of V, Va, VI, VIIa and VIII have been established by single crystal X-ray diffraction. A general mechanistic scheme for the diyne ligand cyclization and cluster framework transformations is suggested and discussed. 相似文献