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′-bpy)(2)](2)[PMo(VI)(8)V(V)(2)V(IV)(2)O(40)(V(IV)O)(2)])[Cu(I)(2,2′-bpy)]}∙2H(2)O (1) and {[Cu(II)(2,2′-bpy)(2)](2)[SiMo(VI)(8.5)Mo(V)(2.5)V(IV)O(40)(V(IV)O)(2)]}[Cu(I)(0.5)(2,2′-bpy)(H(2)O)(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′-bpy)](+) unit linking bi-supported POMs anion {[Cu(II)(2,2′-bpy)(2)](2)[PMo(VI)(8)V(V)(2)V(IV)(2)O(40)(V(IV)O)(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.