Abstract
Two polynuclear manganese(II) sandwiched heteropolytungstates, Na10(HC3H4N2){[Na(H2O)][Mn(C3H4N2)]3[SbW9O33]2}·20H2O (1) and (C4H7N2)10[Mn4(H2O)2(PW9O34)2] (2), have been obtained by conventional aqueous synthesis method and characterized by IR spectra, TG, elemental analyses and single crystal X-ray diffraction. In compound 1, the three-nuclear manganese cluster is sandwiched by two [B-α-SbW9O33]9− units, and each manganese (II) is coordinated by one imidazole (im) molecule. Differently, compound 2 has a four-nuclear manganese (II) cluster with two coordination water molecules. The 2-methylimidazole (mim) molecules float around the polyanions and connect them into a 3D supramolecular framework by hydrogen bondings. The magnetic investigation for compound 1 indicates the existence of weak antiferromagnetic interaction in the sandwiched three-nuclear [Mn(C3H4N2)]3 cluster.
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