Synthesis, Structure and Property of a Dawson-type Arsenomolybdate with an Appended AsIII Cap

An inorganic-organic hybrid compound, (H(2)bpy)(3)[(AsAs2)-As-III Mo-V(15) Mo-VI(3) O-V(62)]center dot 3H(2)O (bpy: 4,4'-bipyridine) (1) has been synthesized under hydrothermal conditions and characterized by elemental analysis, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction, IR spectrum, UV-Vis spectrum, thermogravimetric analysis and single-crystal X-ray diffraction. The crystallographic analysis reveals that compound 1 is composed of a Wells-Dawson polyoxoanion [As-2 Mo-V(15) Mo-VI(3) O-V(62)](9-) with the mixed valence of Mo-V,Mo-VI, which acts as a tetradentate ligand coordinating with the As-III cation to form the mixed valence As-III,As-V containing arsenomolybdate with the single cap structure in a chelate coordination mode. In the solid state, compound 1 shows a 3D supramolecular structure through hydrogen-bonding interactions (C-H center dot center dot center dot O, N-H center dot center dot center dot O, N-H center dot center dot center dot N). In addition, compound 1 exhibits reversible multi-electron redox processes and effective electrocatalytic activities towards the reduction of H2O2, NaNO2 and KBrO3. Moreover, compound 1 is used as a reducing agent of the graphene oxide to prepare graphene by a green chemistry type one-step synthesis method, which is characterized by XPS, Raman spectroscopy, PXRD, IR, scanning electron microscopy and transmission electron microscopy.