Methylammonium-templated transition-metal (Mn, Cd) vanadates: Synthesis, structures, Eu3+-adsorption and magnetic properties

Abstract Two methylammonium-templated metal vanadates, namely [CH3NH3]2MV2O7 (M = Mn (1) and Cd (2)), have been solvothermally synthesized and characterized by IR, TGA, UV–Vis, single-crystal X-ray diffraction (XRD) and Powder XRD, etc. These two isostructural compounds feature an open-framework structure constructed by MO6 octahedra and V2O7 dimers. The methylammonium cations are located in the channels of the framework and act as bi-functional charge-compensating and structure-directing agents. Compound 1 exhibits an effective adsorption performance towards Eu3+ by means of ion exchange. Magnetic study reveals the antiferromagnetic exchange between Mn2+ ions in compound 1.