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排序方式: 共有159条查询结果,搜索用时 15 毫秒
31.
S. A. Novikov L. B. Serezhkina M. S. Grigor’ev N. V. Manakov V. N. Serezhkin 《Russian Journal of Inorganic Chemistry》2018,63(10):1309-1314
The structures of two new coordination polymers, namely, hydroxyl ammonium glutaratouranylate NH3OH[UO2(C5H6O4)(C5H7O4)] · H2O (I) and diethyl ammonium glutaratouranylate NH2(C2H5)2[UO2(C5H6O4) (C5H7O4)] · 2H2O (II), have been characterized by single-crystal X-ray diffraction. It has been established that the structures of complexes I and II contain [UO2(C5H6O4)(C5H7O4)]–infinite chains with the crystallochemical formula AQ02B01 (\(\rm{A = UO_2^{2+}}, Q^{02} = C_5H_6O_4^{2-}, B^{01} = C_5H_7O_4^{-}\)). Despite the identical compositions, uranyl glutarate chains in the studied structures appreciably differ from each other by their geometry and linking. The specific features of nonbonded interactions in the structures of complexes I and II have been characterized by the Voronoi–Dirichlet method of molecular polyhedra. 相似文献
32.
YU.A. Dyadin E.G. Larionov A.Yu. Manakov A.V. Kurnosov F.V. Zhurko E.Ya. Aladko A.I. Ancharov B.P. Tolochko M.A. Sheromov 《Journal of inclusion phenomena and macrocyclic chemistry》2002,42(3-4):213-218
The pressure dependence (0.4 Mpa–1.3 GPa) of the hydrate decomposition temperatures in the sulfur hexafluoride-water system has been studied. In addition to the known low-pressure hydrate SF617H2O of Cubic Structure II, two new high-pressure hydrates have been found. X-ray analysis in situ showed the gas hydrate forming in the sulfur hexafluoride-water system above 50 MPa at room temperature to be of Cubic Structure I. The ability of water to form hydrates whose structures depend on the guest molecule size under normal conditions and at high pressures is discussed. 相似文献
33.
A. Yu. Manakov J. Lipkowski 《Journal of inclusion phenomena and macrocyclic chemistry》1997,29(1):41-55
Sorption equilibria have been studied in the systems solid -[Ni(NCS)2(4-MePy)4] clathrate – gaseous guest (benzene, furan,tetrahydrofuran, propane, CH2Cl2, CH2Br2, methanol). Analysis of theexperimental data shows that the solid–gas equilibrium in this systemcannot be regarded as simple physical sorption by a rigid host lattice. Itwas found that the isosteric heats of guest sorption decrease withincreasing guest uptake in all systems studied. The observed phenomena areinterpreted as the result of a guest to host influence and guest–guest repulsion. The molecular model of guest sorption by the-[Ni(NCS)2(4-MePy)4] host was suggested on the basis of combinedanalysis of sorption isotherms and the dependence of the isosteric heat ofsorption on clathrate composition. 相似文献
34.
Andrew G. Ogienko Elissa A. Ukraintseva Tatyana A. Chingina Vladislav Yu. Komarov Andrey Yu. Manakov 《Journal of inclusion phenomena and macrocyclic chemistry》2005,53(3-4):231-236
The phase diagram of the pyridine–iron(III) chloride system has been studied for the 223–423 K temperature and 0–56 mass-% concentration ranges using differential thermal analysis (DTA) and solubility techniques. A solid with the highest pyridine content formed in the system was found to be an already known clathrate compound, [FePy3Cl3]·Py. The clathrate melts incongruently at 346.9 ± 0.3 K with the destruction of the host complex: [FePy3Cl3]·Py(solid)=[FePy2Cl3](solid) + liquor. The thermal dissociation of the clathrate with the release of pyridine into the gaseous phase (TGA) occurs in a similar way: [FePy3Cl3]·Py(solid)=[FePy2Cl3](solid) + 2 Py(gas). Thermodynamic parameters of the clathrate dissociation have been determined from the dependence of the pyridine vapour pressure over the clathrate samples versus temperature (tensimetric method). The dependence experiences a change at 327 K indicating a polymorphous transformation occurring at this temperature. For the process ${1 \over 2}[\hbox{FePy}_{3}\hbox{Cl}_{3}]\cdot \hbox{Py}_{\rm (solid)} = {1 \over 2}[\hbox{FePy}_{2}\hbox{Cl}_{3}]_{\rm (solid)} + \hbox{Py}_{\rm (gas)}$ in the range 292–327 K, ΔH $^{0}_{298}$ =70.8 ± 0.8 kJ/mol, ΔS $^{0}_{298}$ =197 ± 3 J/(mol K), ΔG $^{0}_{298}$ =12.2 ± 0.1 kJ/mol; in the range 327–368 K, ΔH $^{0}_{298}$ =44.4 ± 1.3 kJ/mol, ΔS $^{0}_{298}$ =116 ± 4 J/(mol K), ΔG $^{0}_{298}$ =9.9 ± 0.3 kJ/mol. 相似文献
35.
36.
Electron photorecombination in the presence of a strong low-frequency laser field has been analyzed using an exactly solvable
quantum model. It has been shown that interference patterns in the electron photorecombination spectrum are more sensitive
to the details of the atomic potential than those in the case of other non-linear processes. For electron photorecombination
on Xe+ ions, the manifestation of the Ramsauer effect in the cross section for the elastic scattering of slow electrons on Xe+ ions has been predicted in the electron photorecombination spectrum modified by the laser field. 相似文献
37.
38.
Vladimir V. Shchennikov Andrei Y. Manakov 《Journal of Physics and Chemistry of Solids》2010,71(8):1168-1174
The paper reports details of a high-pressure thermoelectric power (Seebeck effect) technique up to 40 GPa. Several different types of high-pressure cells with anvil insets are presented. The technique was applied for measurements of pressure dependence of the thermopower of several substances including elemental metals (lead, Pb; indium, In), cerium-nickel alloy, Ce-Ni and sulphur, S. Two peculiarities in the pressure dependences of the thermopower of CeNi were found and attributed to structural transformations, near ∼5 and ∼10 GPa. These transitions were confirmed in direct X-ray diffraction studies. Sulphur compressed to 40 GPa exhibited a hole type conductivity and the thermopower value was about ∼+1 mV/K. Additionally, as an example of pressure calibration, the data on the electrical resistivity of zinc selenide, ZnSe, are given in a range of 0-23 GPa. These data suggest three possible scenarios of phase transitions from a rock salt (RS) high-pressure phase of ZnSe under decompression: RS→zinc blende (ZB), RS→cinnabar→ZB, and RS→wurtzite. 相似文献
39.
A New Gas Hydrate Structure 总被引:1,自引:0,他引:1
40.