(IUCr) Crystallography Journals Online

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Acta Cryst. (2003). E59, o1980-o1983 [ doi:10.1107/S1600536803026138 ]

Bis(4,4'-bipyridinium) bis(8-hydroxyquinoline-5-sulfonate) bipyridine pentahydrate

S. Baskar Raj, P. T. Muthiah, G. Bocelli and A. Cantoni

Abstract: In the title compound, 2C₁₀H₉N₂⁺·2C₉H₆SO₄^-·C₁₀H₈N₂·5H₂O, the asymmetric unit contains two 8-hydroxyquinoline-5-sulfonate (HQS) anions, two 4,4'-bipyridinium ions, a neutral 4,4'-bipyridine molecule and five water molecules. The sulfonic acid group is deprotonated. Interestingly, in both the HQS anions, the O-H bond is oriented away from the quinoline-N atom, since the water molecule competes in hydrogen bonding with the quinolinol-O atom. The neutral 4,4'-bipyridine and one of the protonated 4,4'-bipyridine moieties are bridged by two water molecules, resulting in a `U'-shaped hydrogen-bonded molecular arrangement. Many stacking interactions were observed between: (i) the pyridine rings of bipyridine moieties; (ii) the pyridine rings of bipyridine and HQS moieties; (iii) the pyridine ring of bipyridine and the benzene ring of the HQS anion.

Online 22 November 2003