Two new molybdenum(V) phosphates containing sandwich-shaped clusters with zero- and three-dimensional structures

Two reduced molybdenum(V) phosphates, (H2dien)4[CaMo12O24(OH)6(HPO4)8]·nH2O (1) and (H2dien)4[Ba2(H2O)4CaMo12O24(OH)6(HPO4)4(PO4)4]·nH2O (2) (dien = diethylenetriamine) have been prepared under hydrothermal conditions and characterized by elemental analyses, IR, UV–vis, cyclic voltammetry and single-crystal X-ray diffraction. [Mo6P4] units in both structures are linked by octahedrally coordinated Ca(II) cations into sandwich-shaped [Ca(Mo6P4)2] clusters. While the clusters in 1 are discrete, those in 2 are interconnected through BaO9 polyhedra into a three-dimensional framework structure. It was indicated that the compounds exhibit photocatalytic activity in the bleaching of rhodamine B.

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