Monolacunary Germanomolybdates Binding with Transition-Metal Ions (CoII, NiII, and MnII) in Aqueous Solution: Synthesis, Crystal Structures, and Magnetic Properties

Authors

  • Na Wang,

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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  • Fengyan Li,

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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  • Yuchao Wang,

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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  • Lin Xu,

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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  • Keyu Cui,

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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  • Bingbing Xu

    1. Key Laboratory of Polyoxometalates, Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China, Fax: +86-431-85098760
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Abstract

Three unusual transition-metal-monosubstituted germanomolybdates, [C3H5N2]6[GeMo11Co(H2O)O39]·9H2O (1), [C3H5N2]6[GeMo11Ni(H2O)O39]·9H2O (2), and [C3H5N2]6[GeMo11Mn(H2O)O39]·6H2O (3), have been synthesized by the reactions of transition-metal ions (Co2+, Ni2+, Mn2+) with H4[α-GeMo12O40]·14H2O in aqueous solution, isolated as the imidazole salts, and characterized by single-crystal and powder X-ray diffraction analyses, IR and UV/Vis spectrometry, cyclic voltammetry, elemental analysis, magnetic properties, and thermal gravimetric analysis. These are the first examples of transition-metal-monosubstituted germanomolybdates. The UV/Vis spectra of compounds 13 were recorded to investigate the influences of pH on the stability of the compounds in aqueous solution. The magnetic studies of compounds 1 and 2 indicate magnetic behavior typical of single transition-metal ions. The catalytic activity of complex 1 was also explored, and indicated its potential application in homogeneous catalysis.

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