(IUCr) Crystallography Journals Online

[Contents scheme]

Acta Cryst. (2008). E64, m111 [ doi:10.1107/S1600536807063787 ]

Poly[piperazinediium [aquabis(-pyridine-2,5-dicarboxylato)zincate] dihydrate]

H. Aghabozorg, Z. Derikvand, A. Nemati, Z. Bahrami and J. Attar Gharamaleki

Abstract: The polymeric title compound, {(C₄H₁₂N₂)[Zn(C₇H₃NO₄)₂(H₂O)]·2H₂O}_n, was obtained by the reaction of zinc(II) nitrate hexahydrate with the proton-transfer compound (pipzH₂)(py-2,5-dc) (where pipz is piperazine and py-2,5-dcH₂ is pyridine-2,5-dicarboxylic acid) in aqueous solution. Each Zn^II atom is coordinated in a distorted octahedral geometry by four O atoms and two N atoms from one water molecule and two (py-2,5-dc)^2- ligands, which also act as bridging ligands between Zn^II atoms. [pi] - [pi] Stacking interactions between two aromatic rings of (py-2,5-dc)^2- fragments, with centroid-centroid distances of 3.4747 (7) and 3.7081 (7) Å are observed. The crystal structure is stabilized by O-HO and N-HO hydrogen bonds.

Online 6 December 2007