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1.
A. V. Oreshkina G. Z. Kaziev A. V. Steblevskii 《Russian Journal of Inorganic Chemistry》2009,54(7):1018-1022
Tetraamminecobalt hydrogen hexamolybdoferrate [Co(NH3)4] · H[FeMo6O18(OH)6] · 6H2O (I) and tetraamminecobalt hydrogen hexamolybdogallate(III) [Co(NH3)4] · H[GaMo6O18(OH)6] · 6H2O (II) were synthesized and studied by mass spectrometry, thermogravimetry, IR spectroscopy, and X-ray diffraction. Crystals of I and II are monoclinic; a = 16.21 Å, b = 5.43 Å, c = 12.32 Å, β = 119.63°, V = 1092.11 Å3, ρcalcd = 2.21 g/cm3, and Z = 1 for I; a = 16.24 Å, b = 5.59 Å, c = 12.29 Å, β = 119.79°, V = 1064.05 Å3, ρcalcd = 2.15 g/cm3, and Z = 1 for II. Compounds I and II were used as catalysts for soft oxidation of natural gas. 相似文献
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A. V. Oreshkina G. Z. Kaziev A. V. Steblevskii 《Russian Journal of Inorganic Chemistry》2011,56(4):612-615
Hexaamminecadmium hydrogen hexamolybdocobaltate(III) and hydrogen hexamolybdochromate(III) of compositions [Cd(NH3)6] · H[CoMo6O18(OH)6] · 6H2O (I) and [Cd(NH3)6] · H[CrMo6O18(OH)6] · 6H2O (II), respectively, were synthesized and studied by mass spectroscopy, thermo-gravimetry, X-ray powder diffraction, and IR spectroscopy. Crystals of I and II are monoclinic. For I: a = 10.79 Å, b = 3.70 Å, c = 11.95 Å, β = 91.05°, V = 470.12 Å3, ρcalc = 2.37 g/cm3, Z = 2; and for II: a = 10.80 Å, b = 3.68 Å, c = 11.97 Å, β = 91.07°, V = 468.98 Å3, ρcalc = 2.36 g/cm3, Z = 2. 相似文献
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Anderson type hexamolybdochromate(III) was utilized as a catalyst for facile conversion of various aliphatic, benzylic and heterocyclic alcohols to corresponding aldehydes and ketones in good yields. The reaction was carried out in 50% aq. acetonitrile using hydrogen peroxide as the oxidant at 50 °C. The reaction was found to involve oxidation of the catalyst to its active Cr(V) intermediate by hydrogen peroxide. 相似文献
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A. V. Oreshkina G. Z. Kaziev A. V. Steblevskii T. Yu. Glazunova 《Russian Journal of Inorganic Chemistry》2013,58(8):906-909
[Co(NH3)6] · H2[NiMo6O18(OH)6] · 6H2O (I) and [Co(NH3)6] · H2[ZnMo6O18(OH)6] · 6H2O (II) have been synthesized and studied by mass spectroscopy, thermogravimetry, and X-ray powder diffraction. The crystals of compounds I and II are monoclinic, Z = 1; for compound I: a = 16.10 Å, b = 5.58 Å, c = 12.22 Å, β = 117.86°, V = 1045.14 Å3, and ρcalcd = 2.26 g/cm3; for compound II: a = 16.12 Å, b = 5.52 Å, c = 12.12 Å, β = 117.90°, V = 1043.21 Å3, and ρcalcd = 2.21 g/cm3. 相似文献
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V. V. Sharutin O. K. Sharutina L. G. Mel'nikova G. K. Fukin L. N. Zakharov A. I. Yanovsky Yu. T. Struchkovdt 《Russian Chemical Bulletin》1996,45(8):1977-1980
Tetraphenylantimony hydrogen phthalate, Ph4SbOC(O)C6H4000H-o, was prepared by the reaction of pentaphenylantimony with phthalic acid. According to the data of X-ray structural analysis, the resulting compound is a trigonal-bipyramidal complex of antimony with three phenyl groups in equatorial positions; the fourth phenyl group and the carboxyl fragment are in axial positions. The CSbO angle is 177.5(1)° the Sb-C(Ph)eq and Sb-C(Ph)ax distances are 2.099(4)-2.177(4) A and 2.129(4) A, respectively. The H atom of the free carboxyl group and the carbonyl O atom of another carboxylate group form an intramolecular hydrogen bond.DeceasedTranslated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 2082–2085, August, 1996. 相似文献
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Synthesis and variable-temperature FTIR study of five chiral liquid crystals induced by intermolecular hydrogen bonding 总被引:3,自引:0,他引:3
Yanqing Tian Fengyu Su Yingying Zhao Xuyang Luo Xinyi Tang Xiaoguang Zhao Enle Zhou 《Liquid crystals》1995,19(6):743-748
Five new chiral liquid crystal systems induced by intermolecular hydrogen bonding between 4-[(s)-2-chloro-3-methyl]butyroyloxy-4'-stilbazole (MBSB, proton acceptor) and 4-alkoxybenzoic acids (nBA, proton donors) were prepared. Their liquid crystalline properties were investigated by DSC and polarized optical microscopy. Chiral nematic and chiral smectic phases were observed, and the thermal stability of one complex was studied through temperature dependent infrared spectroscopy. 相似文献
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[reaction: see text] A convenient synthesis of monodendrons whose conformation is restricted through the intervention of intramolecular hydrogen bonding and repulsive electrostatic interactions is described. X-ray crystal structure analysis of the second generation dendron shows the presence of a propeller-type secondary structure and indicates that the dendrons have assembled into a symmetrically interdigitated dimer in the solid state. 1H NMR and IR spectral data are in agreement with the presence of intramolecular hydrogen bonding between the amides and the pyridine N throughout the dendron structure in solution. 相似文献
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Farahnaz Hamzehee Duane Choquesillo-Lazarte 《Phosphorus, sulfur, and silicon and the related elements》2017,192(3):359-367
Two novel phosphinic amides, (C6H5)2P(O)(NH?cyclo?C7H13) (I) and (C6H5)2P(O)(NH?cyclo?C6H11) (II) were synthesized and characterized by spectroscopic methods and X-ray crystallography. Both compounds crystallize in the orthorhombic chiral space group P212121 and in both structures, the N—H···O hydrogen bonds lead to one-dimensional arrangements along the a axis. The molecular geometries and vibrational frequencies of I and II were investigated with quantum chemical calculations at the B3LYP/6–311G** level of theory. Furthermore, the hydrogen bonds were studied by means of the Bader theory of atoms in molecules (AIM) and natural bond orbital (NBO) analysis. 相似文献
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Zeolite-casted microporous carbons (ZMiPCs) were synthesized using the replica casting method. The ZMiPC were also treated chemically by H(3)PO(4) (A-ZMiPC) or KOH (B-ZMiPC) impregnation, to investigate the effect of the acceptor-donor interaction on the hydrogen storage behaviors. The presence of functional groups of the modified ZMiPC surfaces was confirmed by X-ray photoelectron spectroscopy. The total acidity of the carbon surfaces was determined using the Boehm titration method. The microstructure was characterized by X-ray diffraction. The N(2)/77K adsorption/desorption isotherms were analyzed to characterize specific surface area, pore volume, and pore size distribution of the samples. The capacity of hydrogen adsorption was evaluated using a pressure-composition-temperature apparatus at 298K/100bar. From these results, the specific surface areas and micropore volume of ZMiPC increased more than two fold compared to the zeolite template. Meanwhile, the textural properties of A-ZMiPC and B-ZMiPC were decreased by the chemical treatments. Consequently, the largest hydrogen storage was obtained on A-ZMiPC, even though their textural properties had decreased, due to a charge induced dipole interaction between the modified carbon surface and hydrogen molecules. 相似文献
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A. V. Churakov E. A. Ustinova P. V. Prikhodchenko T. A. Tripol’skaya J. A. K. Howard 《Russian Journal of Inorganic Chemistry》2007,52(10):1503-1510
New alkali metal hydrogen tellurates have been synthesized, and their structures have been determined by X-ray crystallography. Hydrogen tellurates I–VI contain centrosymmetric binuclear anions [Te2O10H4+x ](4?x)?, where x=0, 1, 2. Hydrogen tellurates II and VI contain, in addition to the binuclear anion, mononuclear species [TeO6H4]2? and Te(OH)6, respectively. The CNs of alkali metals vary from 8 to 12. In all structures, the hydrogen atoms (of both the hydroxy groups and water molecules) are involved in hydrogen bonding. 相似文献
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We report the details of our study to synthesize a new endohedral fullerene, H2@C60, in more than 100 mg quantities by closure of the 13-membered ring orifice of an open-cage fullerene using four-step organic reactions. The 13-membered ring orifice in a previously synthesized open-cage fullerene incorporating hydrogen in 100% yield was reduced to a 12-membered ring by extrusion of a sulfur atom at the rim of the orifice, and the ring was further reduced into an eight-membered ring by reductive coupling of two carbonyl groups also at the orifice. Final closure of the orifice was completed by a thermal reaction. Purification of H2@C60 was accomplished by recycle HPLC. A gradual downfield shift of the NMR signal for the encapsulated hydrogen observed upon reduction of the orifice size was interpreted based on the gauge-independent atomic orbital (GIAO) and the nucleus-independent chemical shift (NICS) calculations. The spectral as well as electrochemical examination of the properties of H2@C60 has shown that the electronic interaction between the encapsulated hydrogen and outer C60 pi-system is quite small but becomes appreciable when the outer pi-system acquires more than three extra electrons. Four kinds of exohedral derivatives of H2@C60 were synthesized. The tendency in the shift of the NMR signal of the inner hydrogen was found to be quite similar to that observed for the 3He NMR signal of the corresponding derivatives of 3He@C60. 相似文献
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Yanqing Tian Xiaohe Xu Yingying Zhao Xinyi Tang Fengyu Su Xiaoguang Zhao Enle Zhou 《Liquid crystals》1995,19(3):295-300
The synthesis of three new series of chiral Schiff's bases containing benzilideneaniline and 2-hydroxybenzilideneaniline moieties as mesogenic cores is presented. Differential scanning calorimetry, optical polarizing microscopy and X-ray diffraction measurements were used to study the phase transition temperatures and behaviour. The results reveal that most of these materials show chiral smectic mesomorphism. 相似文献
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《Supramolecular Science》1997,4(1-2):35-42
This paper describes a novel system, in which colloidal platinum particles and a zirconium viologen-phosphonate material (ZrVP) are both strongly interacting with a polymer surfactant template. A method of sequential treatment and dialysis was developed to grow the metal phosphonate compound on the phosphonate groups of the polymer surfactant template. This polymer surfactant also functions as a protecting agent for platinum colloids in aqueous solution to prevent aggregation and precipitation. Monitoring the growth of ZrVP by electronic spectroscopy shows that the compound grows incrementally on the polymer surfactant template. Transmission electron microscopic study shows a blanket-like morphological feature for these templated materials. Photoreduction of viologen in these compounds leads to the formation of a stable charge separated state. Photoreduced materials are very air-sensitive. Photochemical hydrogen generation shows a 5 times higher yield of H2 than an analogous microcrystalline sample without a polymer surfactant template. 相似文献
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Lifang Song Shuang Wang Chengli Jiao Xiaoliang Si Zhibao Li Shuang Liu Shusheng Liu Chunhong Jiang Fen Li Jian Zhang Lixian Sun Fen Xu Fenglei Huang 《The Journal of chemical thermodynamics》2012
The growing use of conventional energy such as fossil fuels results in problems degrading our environment. Hydrogen is frequently discussed as a clean energy in the future without pollution. However, efficient and safe storage of hydrogen constitute a key challenge and unresolved problem. One of the main options is solid-state storage technology. A successful solid-state reversible storage material should meet the requirements of high storage capacity, suitable thermodynamic properties, reversibility and fast adsorption and desorption kinetics. This feature article focuses mainly on the development of thermodynamic improvement of hydrogen storage materials in the past few years including the complex hydride, ammonia borane, and metal-organic frameworks. 相似文献
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A series of 2,5-diarylthiazole derivatives exhibiting an intramolecular hydrogen bond has been synthesized. The scintillation efficiency of each member of the series has been determined relative to 2,5-diphenyloxazole. Introduction of an OH group in ortho positions of 2,5-diphenyloxazole and 2,5-diphenylthiazole has led to a red shift of the fluorescence spectra due to intramolecular hydrogen bond, as supported by quantum chemical calculations. 相似文献