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

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-HPW9O34)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-MnII substituted sandwich-type polyoxotungstates [Mn4(DMF)2(α-B-HPW9O34)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-HPW9O34)2]8− in 1 and the reported [Mn4(H2O)2(α-B-PW9O34)2]10− is that two DMF ligands substitute two H2O ligands on the Mn4O16 unit located in the sandwich belt. Magnetic susceptibility measurement indicates the occurrence of antiferromagnetic coupling interaction within MnII ions.