Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Renmin Street No. 5268, Changchun, P. R. China
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Dalton Trans., 2013,42, 16602-16607
27 Jun 2013,
09 Sep 2013
First published online
10 Sep 2013
Two new porous frameworks [Ni(bix)2][VW12O40]·(H2bix)·H2O (1) and [Co(bix)2][VW12O40]·(H2bix)·2H2O (2) (bix = 1,4-bis(imidazol-1-ylmethyl)-benzene) composed of Keggin polyoxometalates (POMs) and metal–organic coordination polymer sheets have been successfully obtained, and characterized by elemental analysis, IR spectra, thermal gravimetric analysis, and single crystal X-ray diffraction. Structural analysis reveals that the 2D metal–organic coordination polymer sheets in the two compounds are constructed from the transition-metal (TM) cations and the flexible N-donor ligand bix, which are further pillared by POM clusters into the 3D porous frameworks. Powder X-ray diffraction (PXRD) patterns of 1 indicate the structural integrity of the framework in aqueous solution with a wide pH range of 1 to 11, and in common organic solvents (methanol, ethanol and DMF). Photocatalytic studies indicate that compounds 1 and 2 are not only active photocatalysts for degradation of rhodamine B (RB), but very stable and easily separated from the photocatalytic system for reuse as well.
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