Synthesis, structure and magnetic property of the first 2-D organic-inorganic hybrid sandwich-type polyoxotungstate containing O-donor organic ligands

摘要

An unprecedented 2-D organic-inorganic hybrid sandwich-type polyoxotungstate containing O-donor organic ligands [DMAH]4{[Mn(DMF)4]2[Mn4(DMF)2(α-B-HPW9O_(34)2]} (1) (DMA = dimethylamine, DMF = N,N-dimethylformamide) has been solvothermally synthesized and characterized by IR, UV spectra and X-ray single-crystal diffraction. The 2-D organic-inorganic hybrid network of 1 is built by tetra-Mn~(II) substituted sandwich-type polyoxotungstates [Mn4(DMF)2(α-B-HPW9O_(34)2]~(8-) and [Mn(DMF)4]~(2+) cation bridges, which displays the common 2-D (4,4) topological net. It should be noted that the major difference between [Mn4(DMF)2(α-B-HPW9O_(34)2]~(8-) in 1 and the reported [Mn4(DMF)2(α-B-HPW9O_(34)2]~(10-) is that two DMF ligands substitute two H2O ligands on the Mn4O_(16) unit located in the sandwich belt. Magnetic susceptibility measurement indicates the occurrence of antiferromagnetic coupling interaction within Mn~(II) ions.