New Inorganic-organic Hybrid Tetravanadate: Preparation, Characterization and Application in Chemically Modified Electrode

A new inorganic-organic hybrid tetravanadate [Co(2,2'-bpy)(3)](7)V4O12 center dot 11H(2)O(1) has been prepared and characterized. X-Ray diffraction study reveals that compound 1 contains classical cluster anions [V4O12](4-), coordinated cations [Co(2,2'-bpy)(3)](2+) and eleven water molecules, in which an interesting decamer water cluster is formed. The hybrid nanoparticles were firstly used as a bulk-modifier to fabricate a chemically modified paste electrode (1-CPE). The electrochemical behavior and electrocatalysis of 1-CPE have been studied in detail. The results indicate that 1-CPE has a good electrocatalytic activity toward the reduction of bromatc in a 0.5 mol/L H2SO4 aqueous solution. 1-CPE shows remarkable stability that be ascribed to the hydrogen bonding interactions between V4O12 cluster and water cluster, which are very important for practical application in electrode modification.