Acta Cryst. (2008). E64, m797-m798  [ doi:10.1107/S1600536808011781 ]

Bis[hexaaquacobalt(II)] 25,26,27,28-tetrahydroxy-2,8,14,19-tetrathiacalix[4]arene-5,11,17,23-tetrasulfonate monohydrate

H. Akashi and M. Ichikawa

Abstract: In the crystal structure of the title compound, [Co(H₂O)₆]₂(C₂₄H₁₂O₁₆S₈)·H₂O, the thiacalix[4]arenetetrasulfonate (= TCAS^4-) anions adopt a cone-type conformation with an additional water molecule as a guest molecule in the hydrophobic cavity. The TCAS^4- anions are arranged in layers in an up-down fashion. These anionic layers alternate with cationic layers consisting of rather regular octahedral cations (symmetry m). Several medium O-HO hydrogen-bond interactions exist between the aqua ligands of the [Co(H₂O)₆]²⁺ cations and the O atoms of the sulfonate groups. In addition to the two crystallographically different Co atoms, two S and four O atoms are situated on mirror planes.

Online 10 May 2008

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