Structure and characterization of zero- to two-dimensional compounds built up of the sandwich-type clusters and transition-metal linkers |
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| Authors: | Zhiming Zhang Enbo Wang Chao Qin Yangguang Li Rodolphe Clérac |
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| Institution: | a Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Renmin Street No. 5268, Changchun, Jinlin 130024, PR China
b Université Bordeaux 1; CNRS, Centre de Recherche Paul Pascal (CRPP)-UPR 8641, 115 avenue du Dr. A. Schweitzer, 33600 Pessac, France |
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| Abstract: | Five new heteropolyoxotungstates K2Na2Mn2(H2O)12Mn2(H2O)10Mn4(H2O)2(XW9O34)2]·18H2O (X=Ge, 1; X=Si, 2), Na4Mn4(H2O)18Mn4(H2O)2(XW9O34)2]·22H2O (X=Ge, 3; X=Si, 4) and K3Na5Mn2(H2O)6Mn4(H2O)2(SiW9O34)2]·23.5H2O (5) have been obtained by the routine synthetic reactions in aqueous solution. In 1 and 2, two isolated Mn2+ ions are covalently linked to the sandwich-type polyoxoanions Mn4(H2O)2(B-α-XW9O34)2]12− (X=Ge or Si) by two μ2-oxygen atoms resulting in the disupporting sandwich-type polyoxometalates (POMs). Compounds 3 and 4 are built from the disupporting sandwich-type polyoxoanions 1 and 2, linked by additional four Mn2+ ions to construct a 1D ladder-like chain-like structure, which is rarely observed in the POM chemistry. Compound 5 represents the first example of the 2D structure consisting of the sandwich-type polyoxoanion Mn4(H2O)2(SiW9O34)2]12− and the binuclear {Mn2(H2O)6}4+ group. The magnetic studies of compounds 1, 4 and 5 indicate that the antiferromagnetic interactions are predominant in the three compounds between Mn(II) metal ions. |
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| Keywords: | Manganese Polyoxotungstate Magnetism Sandwich |
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