Acta Cryst. (2007). E63, m1552-m1553  [ doi:10.1107/S1600536807020569 ]

Piperazinium tetraaquadi--citrato-dinickelate(II)

H.-Y. Song, C.-C. Huang, J.-H. Luo, X.-H. Huang and D.-S. Liu

Abstract: The title complex, (C₄H₁₂N₂)[Ni₂(C₆H₅O₇)₂(H₂O)₄], was synthesized under solvothermal conditions. Both cation and anion possess crystallographically imposed inversion symmetry. The citrate ion acts as a quadridentate ligand, coordinating through the hydroxyl and two carboxylate O atoms to one nickel atom, and bridging the second metal centre through the remaining carboxylate group. The coordination around each Ni^II atom is completed to distorted octahedral by the O atoms of two water molecules. The crystal structure is stabilized by intra- and intermolecular O-HO and N-HO hydrogen-bonding interactions.

Online 3 May 2007

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