Acta Cryst. (2006). E62, m2269-m2271  [ doi:10.1107/S1600536806032211 ]

Piperazinium bis(pyridine-2,6-dicarboxylato)mercurate(II) hexahydrate

H. Aghabozorg, P. Ghasemikhah, M. Ghadermazi, J. Attar Gharamaleki and S. Sheshmani

Abstract: The reaction of mercury(II) nitrate with the proton-transfer compound (pipzH₂)(pydc), where pipz is piperazine and pydcH₂ is pyridine-2,6-dicarboxylic acid, in aqueous solution leads to the formation of the title compound, (pipzH₂)[Hg(pydc)₂]·6H₂O or (C₄H₁₂N₂)[Hg(C₇H₃NO₄)₂]·6H₂O. The structure features six-coordinate Hg²⁺ (site symmetry 2) with a distorted octahedral geometry. Extensive intermolecular O-HO, N-HO and C-HO hydrogen bonding involving the (pydc)^2- ligand, (pipzH₂)²⁺ (site symmetry 2) as a counter-ion and uncoordinated water molecules forms a three-dimensional network.

Online 23 August 2006

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