A Novel Dimeric Polyoxotungstate Decorated by 3d-4f atoms: K4LaH[As2W20CuO67 (H2O)3]Cl2· 22.5H2O

A novel dimeric polyoxotungstate K4LaH[As2W20CuO67(H2O)3 ]Cl2·22.5H2O has been synthesized and characterized by IR, element analysis TG and cyclic voltammogram. The anion K4LaH[As2W20CuO67(H2O) 3]Cl2·22.5H2O can be characterized as two {AsIIIW9O33}9− moieties linked via a {Cu(OH)}, a {W(H2O)} and a {WO(H2O)} group which total coordination numbers are respectively 5, 5, 6. An additional lanthanide atom connects the dimeric cluster via a W-O-La bond. The X-ray single crystal diffraction shows that it is in the triclinic system, space group P-1, with a = 12.287(6) A, b = 20.197(1) A,c=21.483(1)A,α = 62.584(8)°,β = 74.659(8)°,γ = 75.273(9)°,V = 4509(4)A3, Z = 2. To our known, the polyoxotungstate is the novel sandwich-type polyoxoanion, which is decorated by transition-metal and lanthanide atoms at the same time.