Two new polyoxomolybdate-based organic-inorganic hybrid compounds with copper ions and bridging ligands

Two new polyoxomolybdate-based organic-inorganic hybrid compounds with copper ions and bridging ligands were prepared in a hydrothermal reaction system, and the chemical formulas are [Cu-2(L-1)(4)S][Mo6O19] (1) and [(CuCu2I)-Cu-II(L-2)(5)][beta-Mo8O26] (2) (L-1 = 1,2-bis(iminazole-1-ylmethyl)benzene, L-2 = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene). Complexes 1 and 2 were characterized by elemental analysis, IR spectra, TG analyses and single-crystal X-ray diffraction analyses. Compound 1 exhibits 2-D layers with honeycomb-like cavities, further stacking into a 3-D supramolecular framework with the [Mo6O19](2-) polyoxoanions as guest templates in the honeycomb-like cavities. Compound 2 possesses an overall 3D(2D/3D) framework constituted by the undulating 2-D motifs and the 3D sqp framework. The photocatalytic activities of 1 and 2 under UV light were investigated based on the degradation of methylene blue (MB). Both compounds exhibit efficient catalytic activity for the degradation of MB.