Synthesis and characterization of new two-dimensional molybdenum(V) phosphates: (Hen) 6[ M2(H 2O)Mo 12O 24(OH) 6(H 2PO 4) 3(HPO 4) 4(PO 4)]·4H 2O ( M = K, Na)

Abstract

Two new reduced molybdenum(V) phosphates, (Hen) 6[K 2(H 2O)Mo 12O 24(OH) 6(H 2PO 4) 3(HPO 4) 4(PO 4)]·4H 2O and (Hen) 6[Na 2(H 2O)Mo 12O 24(OH) 6(H 2PO 4) 3(HPO 4) 4(PO 4)]·4H 2O (en = ethylenediamine) have been prepared under hydrothermal conditions and characterized by elemental analyses, IR and single-crystal X-ray diffraction. It was revealed that the sandwich-shaped units [ M(Mo 6P 4) 2] are linked by additional octahedrally-coordinated K or Na atoms into two-dimensional layers. The ethylenediamine cations and the lattice water molecules are nestled in the spaces between layers, and are interacted with the inorganic networks through hydrogen bonds into a three-dimensional supramolecular framework. It was indicated that the compounds exhibit photocatalytic activity in the degradation of rhodamine B.