Sequential Synthesis of 3d–3d Heterometallic Complexes Based on Lacunary Molybdovanadate with Magnetic Properties and Electrocatalytic Activities for Ascorbic Acid

Abstract

Two new molybdovanadate-based heterometallic complexes, (NH4)15[Na(H2O)3]2[Co(H2O)4]2[Cu8(OH)2(H2O)2(V9Mo30O130)]·30H2O (1), (NH4)15[Na(H2O)3]2[Mn(H2O)4]2[Cu8(OH)2(H2O)2(V9Mo30O130)]·36H2O (2) have been synthesized from the reaction of the {V10Mo30Cu8} precursor and transition-metal ions (Mn2+ and Co2+) in aqueous solution. Compounds 1 and 2 are isostructural and exhibit the 1D all-inorganic framework constructed from the Z-shaped {V9Mo30Cu8} anions linked with Co2+ or Mn2+ ions, which is first observed in molybdovanadate system. Magnetic investigations of 1 and 2 indicate the occurrence of strong antiferromagnetic interactions within transition-metal ions. Electrocatalytic experiments demonstrate that 1- and 2-CPEs exhibit good electrocatalytic activities towards the oxidation of ascorbic acid.