Acta Cryst. (2008). E64, m1569-m1570  [ doi:10.1107/S1600536808037586 ]

Hexaaqua(5,7-dihydroxy-4-oxo-2-phenyl-4H-chromene-8-sulfonato)calcium(II) 5,7-dihydroxy-4-oxo-2-phenyl-4H-chromene-8-sulfonate trihydrate

B. Liu and B.-L. Yang

Abstract: In the title compound, [Ca(C₁₅H₉O₇S)(H₂O)₆](C₁₅H₉O₇S)·3H₂O, the Ca centre has a distorted decahedral geometry, coordinated by six O atoms from water molecules and one sulfonate O atom. The crystal structure is stabilized by aromatic - interactions, with centroid-centroid distances of 3.765 (5) and 3.896 (5) Å between the phenyl ring and the benzene ring of the chromene unit of neighbouring molecules. In addition, the stacked molecules exhibit inter- and intramolecular O-HO hydrogen bonds, including the uncoordinated water molecules.

Online 20 November 2008

Copyright © International Union of Crystallography
IUCr Webmaster