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Synthesis, characterization and oxidative activity of heteropolyanion pillared layered compound

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Chinese Science Bulletin 1997年第11期42卷 914-918页

作者： He, QL Gao, J Hu, CW Wang, EB NE NORMAL UNIV DEPT CHEMCHANGCHUN 130024PEOPLES R CHINA

TRANSITION element trisubstituted and Ln bi-（1:11）series heteropolyanion with Keggin struc-ture are excellent catalyst with oxidizing properties.But they have some shortcomingssuch as poor stability and impossible recycle use when they are used in homogeneous oxidation.Anions（An-）,among hydroxides（LDHS）-like layers,having a general formula[M1-x2+Mx3+-

关键词： heteropolyanion pillared layered compound synthesis oxidative activity.

SYNTHESIS　AND　¹⁸³W　NMR　CHARACTERIZATION　OF　A－β－Ge₂W₁8Ti₆O₇₇¹⁴　heteropolyanion

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Chinese Chemical Letters 1995年第3期6卷 265-266页

作者： Meng, L Liu, JF NE Normal Univ Dept Chem Changchun 130024 Peoples R China

ＳＹＮＴＨＥＳＩＳＡＮＤ１８３ＷＮＭＲＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦＡ－β－Ｇｅ２Ｗ１８Ｔｉ６Ｏ７７１４ＨＥＴＥＲＯＰＯＬＹＡＮＩＯＮ￥ＬｕＭＥＮＧ；ＪｉｎｇＦｕＬＩＵ(ＤｅｐａｒｔｍｅｎｔｏｆＣｈ... 详细信息

ＳＹＮＴＨＥＳＩＳＡＮＤ１８３ＷＮＭＲＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦＡ－β－Ｇｅ２Ｗ１８Ｔｉ６Ｏ７７１４ＨＥＴＥＲＯＰＯＬＹＡＮＩＯＮ￥ＬｕＭＥＮＧ；ＪｉｎｇＦｕＬＩＵ(ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，...

关键词： NMR SYNTHESIS AND CHARACTERIZATION heteropolyanion OF Ge2W18Ti6O Ti

SYNTHESIS　AND　^（183）W，^（51）V　NMR　CHARACTERIZATION　OF　a－［GaW9V8O（40）］（5－）　heteropolyanion

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Chinese Chemical Letters 1994年第7期5卷 603-604页

作者： Xiao Peng ZHAN and Jing Fu LIU(Department of Chemistry Northeast Normal University, Changchun 130024)

The trivanadium-subatituted heteropolytungstates have been synthesized from their lacunary precusor a-Na9GaW9O(34)H2.(183)W NMR spectrum of the title anion consists of two lines as expected for the C3v structure of th... 详细信息

关键词： NMR OF SYNTHESIS GaW9V8O heteropolyanion AND CHARACTERIZATION

Charge Transport Processes of Immobilized heteropolyanions at Self-assembled Monolayer Modified Gold Electrode by Electrochemical Quartz Crystal Microbalance Measurement

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Chemical Research in Chinese Universities 2009年第4期25卷 537-542页

作者： BU Xin-yuan JIAO Lian-sheng HAN Dong-xue YANG Gui-fu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China School of Computer Science Northeast Normal University Changchun 130024 P. R. China

The in situ electrochemical quartz crystal microbalance（EQCM） technique was used to investigate the ion transport of immobilized heteropolyanions at a self-assembled monolayer（SAM） modified gold electrode during electrochemical redox process.A mixed transfer method was presented to analyse the abnormal change of resonant frequency based on the simultaneous insertion/extraction of different ions.The results indicate that the migration of HSO4-anions was indispensable in the redox process of the heteropolyanions in a 1 mol/L H2SO4 solution and played a key role in the abnormal change of the resonant frequency.Such a change was attributed to different packing densities derived by means of differently immobilized methods.

关键词： heteropolyanion Charge transport Self-assembled monolayer Electrochemical quartz crystal microbalance

Comparative study between gas phase and liquid phase for the production of DMC from methanol and CO_2

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Journal of Natural Gas Chemistry 2012年第2期21卷 189-193页

作者： Ahmed Aouissi Salem S. Al-Deyab Department of Chemistry King Saud University

Direct synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide over Co1.5PW12O40 in liquid and in gas phase is investigated. The synthesized catalyst has been characterized by means of FTIR and XRD. Liquid phase experiment results showed that high pressures are favorable for the synthesis of DMC. However, DMC formation is limited by the reaction with co-produced water. DMC selectivity is more strongly dependent on the temperature than on the pressure of CO2. As for the reactions in gas phase, it has been found that both CH3OH conversion and DMC selectivity decreased with increasing temperature, owing to the decomposition of DMC at high temperatures. High temperatures and more amount of Co1.5PW12O40 catalyst favor the formation of dimethoxymethane （DMM） and methyl formate （MF）.

关键词： heteropolyanion Keggin structure methanol dimethyl carbonate carbon dioxide

Synthesis, Crystal Structure and Electrochemistry of Two Complexes (YLn)^(3+)[PW_(12)O_(40)]^(3-)(L=Me_2SO, Me_2NCHO)

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Chemical Research in Chinese Universities 2008年第3期24卷 255-259页

作者： HAN Qiu-xia WANG Chun-zhang Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, P R. China NIU Jing-yang WANG Jing-ping Basic Experiment Teaching Center School of Chemistry and Chemical Engineering Henan University Kaifeng 475001 P R. China Institute of Molecular and Crystal Engineering School of Chemistry and Chemical Engineering Henan University Kaifeng 475001 P R. China

The reaction of α-H3[PW12O40] with Y（NO3）3 in the presence of DMF or DMSO leads to two complexes with the formulae {Y（DMSO）7}·PW12O40（1） and {[Y（DMF）7]2PW12O40}·PW12O40（2）. The crystal structures indicate that complex 1 consists of discrete [YLn]3＋ cations and α-Keggin heteropolyanions [PW12O40]3-, whereas, in complex 2, donor-acceptor interaction results in a cation-anion-cation triplet. In addition, the electrochemical behavior of the two complexes indicates the usual successive reduction processes of the W atoms in the anions.

关键词： Yttrium complex Crystal structure Electrochemistry study heteropolyanion

Studies on the Redox Properties of Rare Earth Heteropoly Tungstoarsenate K_17[Ln(As_2W_17O_61)_2]·xH_2O

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Chemical Research in Chinese Universities 1993年第3期9卷 175-180页

作者： LIU Jing-fu, WANG Guang and ZHAO Ben-liang (Department of Chemistry, Northeast Normal University, Changchun, 130024)

The redox properties of K17[Ln(As2W17O61)2](Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Tm or Yb) in solution were investigated using polarographic and cyclic voltammographic methods. Experimental results indicate that the heteropolyanions underwent three-step-two-electron-tungsten-reduction processes, and each reduction process was accompanied by adding two protons.

关键词： Lanthanide heteropolytungstate Redox property heteropolyanion

A New Sandwich Type Transition Metal Substituted Polyoxotungstate under Hydrothermal Conditions: [NH_3(CH_2)_4NH_3]_6[Co_4(H_2O)_2(B-α-GeW_9O_(34))_2]}·7H_2O

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Chinese Journal of Structural Chemistry 2009年第1期28卷 25-28页

作者：韩秋霞刘云李杰王敬平 Basic Experiment Teaching Center Henan University Institute of Molecular and Crystal Engineering School of Chemistry and Chemical Engineering Henan University

A new sandwich transition metal substituted polyoxotungstate, [NH3（CH2）4NH3]6[Co4（H2O）2（B-α-GeW9O34）2]}·7H2O 1, was hydrothermaUy synthesized and characterized by IR spectra and single-crystal X-ray diffraction. The single-crystal X-ray analysis reveals that the crystal crystallizes in monoclinic system, space group P21/c with a = 16.6073（6）, b = 15.3333（5）, c = 19.9869（7） A, β = 103.41（1）°, Mr = 5481.38, V = 4950.8（3） A3, Z = 2, Dc = 3.677 g/cm^3, F（000） = 4900, μ（MoKa） = 22.165 mm^-1, GOOF = 1.005, the final R = 0.0228 and wR = 0.0527. The crystal structure indicates that the [Co4（H2O）2（B-α-GeW9O34）2]^12- polyoxoanion contains two trivacant Keggin [B-α-GeW9O34]^10- fragments in a staggered fashion linked via a rhomb-like Co4O16 group in a centrosymmetric arrangement （C2h symmetry） leading to a sandwich-type structure.

关键词： heteropolyanion hydrothermal crystal structure sandwich

Synthesis,Characterization and Catalytic Activity of ZnAl Anionic Clay Pillared by α-Na₆[GaW₁₁O₃₉Fe（H₂O）]·18H₂O

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Chemical Research in Chinese Universities 1998年第4期14卷 8-10页

作者： Yu, XW Zhang, SY Huang, RD Zhang, SX Wang, EB NE Normal Univ Dept Chem Changchun 130024 Peoples R China

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅａｎｉｏｎｉｃｃｌａｙｉｓａｌｓｏｃａｌｅｄｌａｙｅｒｅｄｄｏｕｂｌｅｈｙｄｒｏｘｉｄｅ（ｎｏｔｅｄａｓＬＤＨ），ｉｔｓｕｎｉｑｕｅｂａｓｉｃｃａｔａｌｙｔｉｃｆｕｎｃｔｉｏｎ，ｉｎｔｅ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅａｎｉｏｎｉｃｃｌａｙｉｓａｌｓｏｃａｌｅｄｌａｙｅｒｅｄｄｏｕｂｌｅｈｙｄｒｏｘｉｄｅ（ｎｏｔｅｄａｓＬＤＨ），ｉｔｓｕｎｉｑｕｅｂａｓｉｃｃａｔａｌｙｔｉｃｆｕｎｃｔｉｏｎ，ｉｎｔｅｒｅｓｔｉｎｇ“ｍｅｍｏｒｙｅｆｅ...

关键词： Anionic clay heteropolyanion Catalytic activity