Acta Cryst. (2004). E60, m1576-m1579  [ doi:10.1107/S1600536804024067 ]

Diaquabis(7-iodo-8-oxidoquinolinium-5-sulfonato)strontium(II) monohydrate

K. Balasubramani, S. Francis, P. T. Muthiah, G. Bocelli and A. Cantoni

Abstract: The title compound, [Sr(C₉H₅INO₄S₂)₂(H₂O)₂]·H₂O, is isomorphous with the corresponding calcium complex of ferron (8-hydroxy-7-iodoquinoline-5-sulfonic acid). The asymmetric unit consists of one Sr^II ion, two organic ligands, two coordinated water molecules and one uncoordinated water molecule. The Sr^II ion has a pentagonal-bipyramidal coordination geometry made up of O atoms of three different sulfonate groups, deprotonated quinolinol O atoms of two different oxine rings and two water molecules. In the ligands of type I, two O atoms of the sulfonate group are involved in coordination, whereas in type II ligands, only one O atom is involved. Ligands of type I are stacked on top of one another, each pair of adjacent members of the stack being related by an inversion centre. Ligands of type II are also stacked in a similar manner. These molecular stacks are cross-linked by Sr-O(sulfonate) and Sr-O(quinolinol) bonds, leading to an extended framework. This architecture is further stabilized by a number of O-HO and N-HO hydrogen bonds.

Online 9 October 2004

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