Inorganic Chemistry, Vol.50, No.13, 6183-6188, 2011
[HxTeV9O28]((5-x)-) (x=1 and 2): Vanadotellurates with Decavanadate Structure
Two new vanadotellurates, [HTeV9O28](4-) and [H2TeV9O28](3-) have been synthesized and structurally characterized as tetra-n-butylammonium (TBA) salts: TBA(4)-[HTeV9O28]center dot 2CH(3)CN [triclinic, space group P (1) over bar, a = 16.7102(6) angstrom, b = 17.4680(7) angstrom, c = 17.9634(7) angstrom, alpha = 74.412(1)degrees, beta = 67.494(1)degrees, gamma = 74.160(2)degrees, Z = 2] and TBA(3)-[H2TeV9O28] [monoclinic, space group P2(1)/c, a = 13.0013(5) angstrom, b = 19.157(1) angstrom, c = 28.453(1) angstrom, beta = 97.222(2)degrees, Z = 4]. The results of the structural analyses indicate that the four O atoms that bridge two V atoms on the Te side are the most basic ones in the structure. The results of density-functional theory (DFT) calculations support this view.