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.