Abstract
The compound Cs[B5O6(OH)4] · 2 DMSO was prepared by hydrolysis of tris(methoxy)-borane in organic solvents with small amounts of water in presence of cesium tert-butylate and recrystallized in DMSO (dimethyl sulfoxide). Cs[B5O6(OH)4] · 2 DMSO crystallizes in the monoclinic space group Ρ21/a with a= 9.593(2), b=19.179(4), c= 11.585(2) A, β= 119.99(2)° and Ζ = 4. The crystal structure was determined by single-crystal diffractometer data and refined to a conventional R value of 9.9%. The crystal structure consists of chains of pentaborate anions [B5O6(OH)4]- linked by hydrogen bonds. The cesium cation and the DMSO molecules join the chains to sheets by coordination and hydrogen bonds respectively.
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