A Novel Keggin Tungstocobaltate Framework Supported by Copperbipyridyl Complexes: [Cu(I)(2,2' -bipy)2]{[Cu(II)(2,2' -bipy)2]2[HCoW12O40]} · 4H2O

A new organic-inorganic hybrid compound based on Keggin tungstocobaltate units supported by copper complexes, [Cu(I)(2,2’-bipy)2]{[Cu(II)(2,2’-bipy)2]2[HCoW12O40]} ・ 4H2O (bipy = bipyridine), has been synthesized under hydrothermal conditions and characterized by elemental, IR, TG, and XPS analyses and X-ray single-crystal structure determination. The crystal structure is built up from bi-supported Keggin tungstocobaltate polyoxoanions {[Cu(II)(2,2’-bipy)2]2[HCoW12O40]}−, [Cu(I)(2,2’-bipy)2]+ cations and water molecules. The title compound possesses a 1D tangled helical structure composed of {[Cu(II)(2,2’-bipy)2]2[HCoW12O40]}− polyoxoanions via π・ ・ ・π interactions along the c axis. The electrochemical behavior of the title compound was studied.