Acta Cryst. (2003). E59, m46-m49  [ doi:10.1107/S160053680202281X ]

The interplay of coordination, - stacking and hydrogen bonding in the supramolecular self-assembly of bis(-7-iodo-8-hydroxyquinoline-5-sulfonato-³N,O:O')bis[triaquanickel(II)] tetrahydrate

S. B. Raj, P. T. Muthiah, U. Rychlewska, B. Warzajtis, G. Bocelli and R. O'lla

Abstract: The title compound, [Ni(C₉H₄INO₆S)₂(H₂O)₆]·4H₂O, is isomorphous with the corresponding cobalt(II) complex of ferron. Two inversion-related ligands and two Ni^II atoms form a cage-like dimer. Both ligands of the dimer are bridged by a pair of inversion-related Ni-O(sulfonate) bonds. The octahedral coordination geometry of nickel(II) is made up of the ring N atom, the deprotonated quinolinol O atom (the usual bidentate chelation), one of the sulfonate O atoms, and three water molecules. The ligands in the dimer are stacked over one another. This architecture is further stabilized by a number of O-HO hydrogen bonds involving the deprotonated quinolinol O atom, sulfonate O atoms, and uncoordinated and coordinated water molecules.

Online 24 December 2002

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