Acta Cryst. (2013). C69, 841-846 [ doi:10.1107/S0108270113016788 ]
Synopsis: The Rb+ cation is surrounded by nine O atoms from Hpht- anions and water molecules, with a strongly deformed pentagonal-bipyramidal geometry and one apex split into three positions. The crystal packing is governed by numerous hydrogen bonds involving all water molecules and Hpht- anions.
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