Acta Cryst. (2007). E63, m2468-m2469  [ doi:10.1107/S1600536807042651 ]

catena-Poly[piperazindiium [zincate(II)-bis(-pyridine-2,3-dicarboxylato)-³N,O²:O³;³O³:N,O²] tetrahydrate]

H. Aghabozorg, S. Daneshvar, E. Motyeian, M. Ghadermazi and J. Attar Gharamaleki

Abstract: The centrosymmetric title compound, {(C₄H₁₂N₂)[Zn(C₁₄H₆N₂O₈)₂]·4H₂O}_n or {(pipzH₂)[Zn(py-2,3-dc)₂]·4H₂O}_n, where py-2,3-dcH₂ is pyridine-2,3-dicarboxylic acid and pipz is piperazine, was obtained by the reaction of zinc(II) nitrate tetrahydrate with (pipzH₂)(py-2,3-dc) as a proton-transfer compound in aqueous solution. Each Zn^II (site symmetry ) is coordinated in a distorted octahedral geometry by four O atoms and two N atoms from two bidentate (py-2,3-dc)^2- ligands, which also act as bridging ligands between Zn^II atoms. The four donor atoms of the two coplanar (py-2,3-dc)^2- anions form a square-planar arrangement around the Zn^II centre. In the crystal structure, extensive O-HO, N-HO and C-HO hydrogen bonds, as well as ion pairing and - stacking [with a distance of 3.8693 (8) Å between two aromatic rings] between different fragments, play an important role in the stabilization of the supramolecular structure.

Online 8 September 2007

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