A keggin-type arsenotungstate anion-supported transition metal complex: Hydrothermal synthesis and characterization of [Fe(2,2′-bipy) 3]1.5[AsWVI10Wv2O40Fe(2,2′-bipy)2(H2O)] ·0.25H2O

Abstract

A Keggin-type arsenotungstate anion-supported iron-bipyridine complex, [Fe(2,2′-bipy)3]1.5-[AsWVI10WV2O40Fe(2,2′-bipy) 2(H2O)] · 0.25H2O, has been hydrothermally synthesized and characterized by IR and ESR spectra, TG-DTA analysis, and single crystal X-ray diffraction. Each structural unit of the title compound consists of one [AsWVI10WV2O40Fe(2,2′-bipy)2(H2O)] 3- heteropolyanion, one and a half [Fe(2,2′-bipy) 3]2+ cations, and a quarter of an H2O molecule. In the heteropolyanion the [Fe(2,2′-bipy)2(H 2O)]2+ unit is covalently bonded to the reduced Keggin polyoxoanion [AsWVI10WV2O 40]5-. The complex is monoclinic, space group C2/c with a = 46.8079(13), b = 14.3990(4), c = 26.1085(8) Å, β= 90.00(5)°, Z = 8, Dc = 3.10 g/cm3. © 2008 Verlag der Zeitschrift für Naturforschung.