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

Abstract A novel one-dimensional polyoxovanadium borate (H 3 NCH 2 CH 2 NH 3 ) 3 [(VO) 12 O 4 {B 8 O 17 (OH) 4 } 2 {Na(H 2 O)} 2 ]·(H 3 O) 2 (H 2 O) 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 VO 5 square pyramids. Two {B 8 O 17 (OH) 4 } 14− polyborate chains fill in the cavities formed by the V 12 ring. The [(VO) 12 O 4 {B 8 O 17 (OH) 4 } 2 ] 12− clusters are connected by unusual binuclear Na + units into 1D chains. The binuclear Na + units are formed by two neighboring sodium atoms sharing two μ 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.