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Publications (12)23.31 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A novel organic–inorganic hybrid compound: K2(H3O)[CuI7(Bpy)6(BpyEt)2][P2W18O62]2·6H2O 1 (bpy = 4,4′-bipyridine; BpyEt+ = N-ethylbipyridine cation) was hydrothermally synthesized and structurally characterized by routine techniques and single-crystal X-ray diffraction analysis. The compound is a 3D architecture constructed by saturated Dawson polyoxoanions and transition-metal coordination complexes (containing N-ethylated bpy) [CuI7(Bpy)6(BpyEt)2], in which the [P2W18O62]6− (P2W18) clusters are modified by five CuIN coordination polymeric chains. The striking feature of the structures is that there are three kinds of coordination geometries for copperI ions, which are responsible for the formation of polymeric structures. It is also interesting that N-ethylated bpy was firstly in the high dimensional POM framework.
    Journal of Molecular Structure. 02/2009; 919:160-163.
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    ABSTRACT: Two novel compounds constructed by Anderson-type polyoxoanions and copper complexes with mixed ligands, (H3O+)[Cu(C6NO2H4)(phen)(H2O)]2[Al(OH)6Mo6O18]·5H2O (1) and (H3O+)[Cu (C6NO2H4)(phen)(H2O)]2[Cr(OH)6Mo6O18]·5H2O (2) have been isolated by conventional solution method, and characterized by elemental analyses, IR spectra, thermal stability analyses, X-ray powder diffraction and single-crystal X-ray diffraction. Compounds 1 and 2 are isomorphic and reveal an example of three-dimensional supramolecular organic–inorganic hybrids based on copper complexes with mixed 1,10-phenanthroline and pyridine-4-carboxylic acid ligands supported on Anderson-type polyoxoanions. Furthermore, both of the compounds exhibit photoluminescent properties at ambient temperature, and to elucidate the electronic properties of the metal ions (Cu2+ or Cu2+/Cr3+), EPR studies have been performed, and the results are in good agreement with the structural feature of these compounds.
    Journal of Molecular Structure - J MOL STRUCT. 01/2009; 920(1):284-288.
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    ABSTRACT: A one-dimensional (1-D) organic-inorganic hybrid compound {(H3O)[CuI(4,4'-bipy)]3[SiW12O40]} · 1.5H2O (1) has been synthesized from hydrothermal reaction of Keggin polyoxometalate, cupric nitrate and 4,4'-bipyridine (4,4'-bipy). Single crystal X-ray diffraction shows 1-D zigzag chains built up of saturated Keggin polyoxoanions and infinite [CuI(4,4'-bipy)]nn+ units. Zipper-like arrangement of adjacent zigzag chains by hydrogen-bonding interactions leads to a 2-D layer and - interactions of 4,4'-bipy ligands from adjacent layers further result in the 3-D structure of 1. All Cu atoms in 1 are three-coordinated with “T-type” geometries, indicating they are univalent in the resultant compound. This result has further been confirmed by the absence of signal in the EPR spectrum of 1.
    Journal of Coordination Chemistry 01/2009; 62(9). · 1.80 Impact Factor
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    ABSTRACT: An organic–inorganic hybrid compound formulated as {[Cu(2,2′-bpy)(H2O)2]5[Cu(2,2′-bpy)(H2O)]}[P2Mo5O23]2·10H2O (1) has been isolated by conventional solution method and characterized by elemental analyses, IR, thermal stability analysis, magnetic susceptibility measurement and single-crystal X-ray diffraction analysis. The compound is a 1D chain structure built from Strandberg-type polyoxoanions [P2Mo5O23]6− and secondary copper coordination complexes along c axis. Extensive π–π interactions of the 2,2′-bpy ligands and hydrogen bonds from the adjacent chains lead to the three-dimensional structure. Magnetic susceptibility measurement reveals that the compound shows paramagnetic property with a magnetic moment about the Cu2+ ion, indicating very weak antiferromagnetic coupling between the neighboring Cu2+ ions in the structure.
    Journal of Molecular Structure 10/2008; 888(s 1–3):307–312. · 1.40 Impact Factor
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    ABSTRACT: The Dawson anion P 2W 18O 62 (6-) has been used as a noncoordinating polyoxoanion template for the construction of two metal-organic frameworks, namely, [M 2(bpy) 3(H 2O) 2(ox)][P 2W 18O 62]2(H 2-bpy). nH 2O (M = Co(II), n = 3 ( 1); M = Ni(II), n = 2 ( 2)) (bpy = 4,4'-bipyridine; ox = C 2O 4 (2-)). Single-crystal X-ray analysis reveals that both of the structures exhibit 3D host frameworks constructed from the oxalate-bridged binuclear superoctahedron secondary building units (SBUs) and bpy linkers and the voids of which are occupied by Dawson anions, guest bpy, and water molecules. Magnetic studies reveal that there are antiferromagnetic exchange interactions among the transition-metal centers in compounds 1 and 2. Furthermore, a compound 1-modified carbon paste electrode ( 1-CPE) displays good electrocatalytic activity toward the reduction of nitrite.
    Inorganic Chemistry 08/2008; 47(16):7133-8. · 4.59 Impact Factor
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    ABSTRACT: A series of organic-inorganic hybrid compounds, K2H7[{Ln(PW11O39)2}{Cu2(bpy)2(mu-ox)}].xH2O (Ln = La, x approximately = 18 (1); Ln = Pr, x approximately = 18(2); Ln = Eu, x approximately = 16(3); Ln = Gd, x approximately 22(4); Ln = Yb, x approximately = 19 (5); bpy = 2,2'-bipyridine and ox = oxalate), have been isolated by the conventional solution method. Single-crystal X-ray diffraction studies reveal that compounds 1-5 are isomorphic and consist of one-dimensional chains, which are constructed by alternating bis(undecatungstophosphate) lanthanates [Ln(PW11O39)2](11-) and dinuclear copper(II)-oxalate complexes [Cu2(bpy)2(mu-ox)]2+.pi-pi interactions of the bpy ligands from adjacent chains lead to their three-dimensional structures. An analogue of potassium K2H9[{K(PW11O39)2}{Cu2(bpy)2(mu-ox)}1].approximately 20.5H2O(6) has also been obtained. The syntheses and structures of these compounds are reported here. Magnetic properties of 1, 2 and 3 are discussed as well. Attempts to crystallize similar compounds containing Co(II) and Ni(II) were unsuccessful.
    Dalton Transactions 02/2008; · 3.81 Impact Factor
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    ABSTRACT: Two compounds, [Eu(H2O)7][Al(OH)6Mo6O18]·4H2O (1) and {(C2H5NO2)2[Eu(H2O)5]}[Al(OH)6Mo6O18]·10H2O (2), have been synthesized by conventional solution method and determined by single-crystal X-ray diffraction. Compound 1 shows a 1D chain structure built up of alternating Anderson-type polyanions [Al(OH)6Mo6O18]3− and hydrated rare-earth ions Eu3+. Compound 2 displays a 3D supramolecular network structure containing 1D sandglass-like channels along c axis, which were occupied by repetitive array of (H2O)8 clusters. Extensive hydrogen bonds play an important role in the formation of the 3D structures of 1 and 2. Luminescence measurements reveal that 1 and 2 exhibit intense red and orange fluorescent emission at room temperature, respectively. Origin of the distinct emission can be assigned to the different site symmetries of Eu3+ centers in the two compounds. These results are consistent with the crystal structures of the two compounds.
    Inorganica Chimica Acta - INORG CHIM ACTA. 01/2008; 361(7):2013-2018.
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    ABSTRACT: A microporous metal–organic coordination polymer formulated as [Cd2(btec)(H2O)2]·0.8DMF (1), where btec = 1,2,4,5-benzenetetracarboxylate and DMF = N,N-dimethylformamide, has been isolated under solvothermal condition and characterized by elemental analyses, IR, thermal stability analysis, fluorescent spectrum, and single-crystal X-ray diffraction analysis. The framework in 1 possesses a three-dimensional architecture with ordered one-dimensional rhombus channels, the dimensions of channels are approximately 10 Å at the widest and 3 Å at the narrowest spacing considering the van der Waal radii of atoms in the framework running along the a-axis. Furthermore, compound 1 shows intense photoluminescent property at room temperature.
    Journal of Molecular Structure 01/2008; 891:384-387. · 1.40 Impact Factor
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    ABSTRACT: Solvothermal reactions with different solvents produced two iron trimesates [Fe2(H2O)2(BTC)4/3]Cl x 4.5(DMF) (1) and [Fe4Cl(BTC)8/3]Cl2 x H2O x 2.5(DEF) (2) (BTC = 1,3,5-benzenetricarboxylate, DMF = N,N'-dimethylformamide, DEF = N,N'-diethylformamide). The framework of 1 is a (3,4)-connected net constructed from mixed-valence paddlewheel Fe2(II, III) units and BTC linkers, while the framework of 2 is a (3,8)-connected net built from mixed-valence square-planar Fe4(III, III, III, II) units and BTC linkers. The large volume inside the framework of 1 (or 2) is occupied by disordered Cl- anions and guest DMF (or DEF) molecules. The mixed-valence character of the frameworks of 1 and 2 was confirmed by Mössbauer spectroscopy studies. The active electronic property of iron cations may be the origin of the variability of the iron-organic frameworks, which are readily affected by some synthetic factors, such as solvents. Magnetic studies reveal that there are antiferromagnetic exchange interactions among the Fe atoms in 1 and 2. Ion-exchange studies for 1 show that the Cl- anions inside the framework of 1 can be exchanged by CNS- anions.
    Inorganic Chemistry 10/2007; 46(19):7782-8. · 4.59 Impact Factor
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    ABSTRACT: Two novel organic-inorganic hybrid compounds based on Anderson-type polyoxoanions, [Cu2(bpy)2(mu-ox)][Al(OH)7Mo6O17] (1) and [Cu2(bpy)2(mu-ox)][Cr(OH)7Mo6O17] (2), have been synthesized and characterized by elemental analyses, IR, and X-ray powder diffraction. The crystal structures of 1 and 2 have been established by single-crystal X-ray diffraction, which reveals the presence of 1D chains constructed of alternating Anderson-type polyoxoanions and oxalato-bridged dinuclear copper complexes for both compounds and extensive hydrogen bonding that plays an important role in the formation of the 3D supramolecular network structures of 1 and 2. To elucidate the electronic properties and magnetic properties of the metal ions (Cu2+ or Cu2+ and Cr3+), EPR studies and magnetic susceptibility studies have been performed, respectively. The results are consistent with the structural feature of these compounds.
    Inorganic Chemistry 05/2007; 46(9):3541-7. · 4.59 Impact Factor
  • Zeitschrift Fur Anorganische Und Allgemeine Chemie - Z ANORG ALLG CHEM. 01/2007; 633:2049-2052.
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    ABSTRACT: AbstractTwo organic–inorganic hybrid compounds based on the Anderson-type clusters [TeMo6O24]6−, [(H2O)2Co(TeMo6O24)][(C10N2H10)2]·9.5H2O (1), [(C10N2H9)Ni(H2O)3]2[TeMo6O24]·8.5H2O (2), have been synthesized by hydrothermal reactions and characterized by elemental analyses, IR spectra, thermal stability analyses, and single-crystal X-ray diffraction. Compound 1 displays a 1D chain structure constructed from alternating [TeMo6O24]6−clusters and Co2+ along the a axis with two pendant ligands 4,4′-bpy (4,4′-bipyridine). Compound 2 is composed of [TeMo6O24]6− clusters coordinated by [Ni(bpy)(H2O)3]2+ moieties, and a supramolecular architecture is further formed through extensive hydrogen bonds interactions. Graphical AbstractTwo organic–inorganic hybrid compounds based on the Anderson-type clusters [TeMo6O24]6−and the unit [M(4,4′-bpy)] have been synthesized under the hydrothermal conditions. Compound 1 displays a 1D chain structure constructed covalently from alternating polyoxoanions [TeMo6O24]6− and Co2+ along the a axis with two pendant ligands 4,4′-bipyridine. Compound 2 is composed of [TeMo6O24]6− polyoxoanion coordinated by [Ni(bpy)(H2O)3]2+ moieties and shows a 1D chain structure through the hydrogen bonds interactions.
    Journal of Cluster Science 20(3):535-543. · 1.11 Impact Factor