Abstract
Two new polyoxometalate-based inorganic–organic hybrid compounds, Na9[{Na(H2O)2}3{M(C4H6N2)}3(SbW9O33)2] · 28H2O (M = Co(1); M = Mn(2)), have been obtained by routine synthetic reactions in aqueous solutions and characterized by elemental analysis, IR, and thermogravimetric analyses. Single-crystal X-ray diffraction analyses reveal that 1 and 2 are isostructural and crystallize in the same space group P 1. The polyoxoanions in 1 and 2 are composed of two lacunary Keggin-type [B-α-SbW9O33]9− building units, which are linked by three [Na(H2O)2]+ cations and three [M(C4H6N2)]2+ (M = Co(1); M = Mn(2)) fragments, resulting in sandwich-type structures. Furthermore, the sandwich-type polyoxoanions are connected into 3-D frameworks via Na+ and extensive hydrogen-bonding interactions along the a-axis. Electrochemical and photochemical catalysis activities of 1 and 2 have also been investigated.
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