Acta Cryst. (2007). E63, m1917-m1918  [ doi:10.1107/S1600536807028115 ]

Triaqua(4-hydroxypyridine-2,6-dicarboxylato)nickel(II) sesquihydrate

H. Aghabozorg, M. Ghadermazi, J. Soleimannejad and S. Sheshmani

Abstract: The reaction of nickel(II) nitrate hexahydrate with the proton-transfer compound piperazinediium 4-hydroxypyridine-2,6-dicarboxylate, (pipzH₂)(hypydc), where pipz is piperazine and hypydcH₂ is 4-hydroxypyridine-2,6-dicarboxylic acid, in aqueous solution leads to the formation of the title complex, [Ni(C₇H₃NO₅)(H₂O)₃]·1.5H₂O. Nickel(II) is coordinated by three donor atoms of the tridentate dianionic ligand, and three water molecules, in a slightly distorted octahedral geometry. The range of HA and DA distances, and D-HA angles indicates the presence of strong hydrogen bonding in this complex, which involves the coordinated and uncoordinated water molecules (one of which lies on a twofold rotation axis), giving a three-dimensional network.

Online 15 June 2007

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