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)12O4{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 V12 ring, constructed from edge-sharing VO5 square pyramids. Two {B8O17(OH)4}14K polyborate chains fill in the cavities formed by the V12 ring. The [(VO)12O4{B8O17(OH)4}2]12K clusters are connected by unusual binuclear NaC units into 1D chains. The binuclear NaC units are formed by two neighboring sodium atoms sharing two m2–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. q 2004 Elsevier B.V. All rights reserved.