Hydrothermal synthesis and crystal structure of a novel 1D polyoxovanadium borate:: (H3NCH2CH2NH3)3[(VO)12O4 {B8O17(OH)4}2{Na(H2O))2]• (H3O)2(H2O)6.5

A novel one-dimensional polyoxovanadium borate (H3NCH2CH2NH3)(3)[(VO)(12)O-4{B8O17(OH)(4)}(2){Na(H2O)}(2)].(H3O)(2)(H2O)(6.5) (1) has been synthesized by the hydrothermal method and the structure determined by X-ray crystallography. The structure consists of a continuous contorted V-12 ring, constructed from edge-sharing VO5 square pyramids. Two {B8O17(OH)(4)}(14-) polyborate chains fill in the cavities formed by the V-12 ring. The [(VO)(12)O-4{B8O17(OH)(4)}(2)](12-) clusters are connected by unusual binuclear Na+ units into ID chains. The binuclear Na+ units are formed by two neighboring sodium atoms sharing two mu(2)-O from B-O-B. Each sodium atom is in a distorted octahedral geometry. Other characterizations are also described by elemental analysis, thermal analysis and IR, EPR spectra. (C) 2004 Elsevier B.V. All rights reserved.