Two New Compounds Based on Bi-Capped Keggin Polyoxoanions and Cu-Bpy Cations Contain Both Cu^II and Cu^I Complexes: Synthesis, Characterization and Properties

Two inorganic-organic hybrid complexes based on bi-capped Keggin-type cluster, {([Cu-II(2,2 & PRIME;-bpy)(2)](2)[(PMo8V2V2O40)-V-VI-V-V-O-IV((VO)-O-IV)(2)])[Cu-I(2,2 & PRIME;-bpy)]}& BULL;2H(2)O (1) and {[Cu-II(2,2 & PRIME;-bpy)(2)](2)[(SiMo8.5Mo2.5VO40)-Mo-VI-V-V-O-IV((VO)-O-IV)(2)]}[Cu-0.5(I)(2,2 & PRIME;-bpy)(H2O)(0.5)] (2) (bpy = bipyridine), had been hydrothermally synthesized and structurally characterized by elemental analysis, FT-IR, TGA, PXRD and X-ray single-crystal diffraction analysis. Compound 1 consists of a novel 1-D chain structure constructed from [Cu-I(2,2 & PRIME;-bpy)](+) unit linking bi-supported POMs anion {[Cu-II(2,2 & PRIME;-bpy)(2)](2)[(PMo8V2V2O40)-V-VI-V-V-O-IV((VO)-O-IV)(2)]}(-). Compound 2 is a bi-capped Keggin cluster bi-supported Cu-bpy complex. The main highlights of the two compounds are that Cu-bpy cations contain both Cu-I and Cu-II complexes. Furthermore, the fluorescence properties, the catalytic properties, and the photocatalytic performance of compounds 1 and 2 have been assessed, and the results show that both compounds are active for styrene epoxidation and degradation and adsorption of Methylene blue (MB), Rhodamine B (RhB) and mixed aqueous solutions.