Acta Cryst. (2011). E67, i57 [ doi:10.1107/S1600536811039109 ]
Abstract: In the crystal structure of the title compound, K2[B10O14(OH)4]·H2O, the polyborate [B10O14(OH)4]2- anions are linked together through their common O atoms, forming a helical chain-like structure. Adjacent chains are further connected into a three-dimensional structure by O-HO hydrogen bonds. The water molecules and potassium cations are located between these chains. Further O-HO hydrogen bonds occur between the anions and the water molecules
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