(IUCr) Crystallography Journals Online

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Acta Cryst. (2008). E64, m374 [ doi:10.1107/S160053680800161X ]

Poly[piperazinediium [[aquabismuthate(III)]-di--pyridine-2,6-dicarboxylato-bismuthate(III)-di--pyridine-2,6-dicarboxylato] monohydrate]

H. Aghabozorg, A. Nemati, Z. Derikvand and M. Ghadermazi

Abstract: The title compound, {(C₄H₁₂N₂)[Bi₂(C₇H₃NO₄)₄(H₂O)]·H₂O}_n or {(pipzH₂)[Bi₂(pydc)₄(H₂O)]·H₂O}_n, where pydcH₂ is pyridine-2,6-dicarboxylic acid and pipz is piperazine, was obtained by reaction of Bi(NO₃)₃·5H₂O with (pipzH₂)(pydcH)₂·3H₂O in a 1:2 molar ratio in aqueous solution. There are two independent Bi^III atoms in the structure, one of which is eight-coordinate with a distorted bicapped trigonal-prismatic geometry, and another which is nine-coordinate with a distorted tricapped trigonal-prismatic geometry. The carboxylate groups of the (pydc)^2- ligands link dinuclear [Bi₂(C₇H₃NO₄)₄(H₂O)]^2- units into one-dimensional coordination polymers. The pipzH₂²⁺ cations (site symmetry $\\overline{1}$ ) and non-coordinated water molecules lie between these polymers, forming N-HO and O-HO hydrogen bonds to the O atoms of the carboxylate groups.

Online 23 January 2008