Acta Cryst. (2008). E64, m1344-m1345  [ doi:10.1107/S1600536808030808 ]

-Squarato-²O¹:O²-bis{[2-(2-aminoethyl)pyridine-²N,N']aquanickel(II)} squarate 0.25-hydrate

Y. Bekdemir, I. Uçar and O. Büyükgüngör

Abstract: The asymmetric unit of title compound, [Ni₂(C₄O₄)(C₇H₁₀N₂)₄(H₂O)₂]C₄O₄·0.25H₂O, contains one-half of a squarate ligand, one-half of an uncoordinated squarate dianion, two 2-(2-aminoethyl)pyridine ligands and one aqua ligand, all coordinated to an Ni^II ion. The compound also contains 0.25 solvent water molecules. The Ni^II ion has distorted octahedral geometry. The squarate ligand adopts a -1,2 coordination mode, the intradimer Ni^IINi^II separation being 7.1442 (7) Å, while the other squarate unit acts as a counter-anion. The crystal structure is stabilized by intermolecular O-HO and N-HO hydrogen-bond interactions, forming a three-dimensional network.

Online 27 September 2008

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