Acta Cryst. (2003). E59, m849-m850  [ doi:10.1107/S1600536803019196 ]

catena-[₆-1,2,4,5-Benzenetetracarboxylato-tetraaqua-dinickel(II)] dihydrate

S.-Y. Yang, L.-S. Long, R.-B. Huang, L.-S. Zheng and S. W. Ng

Abstract: The two Ni atoms and the ₆-1,2,4,5-benzenetetracarboxylate ligand in the crystal structure of catena-[₆-1,2,4,5-benzenetetracarboxylato-tetraaqua-dinickel(II)] dihydrate, [Ni₂(C₁₀H₂O₈)(H₂O)₄]·2(H₂O), occupy special positions at three independent inversion centers. One of the Ni atoms is chelated by two 1,2,4,5-benzenetetracarboxylates [Ni-O 2.018  (3) and 2.021  (3)  Å; O-Ni-O 91.7  (1)°]; the two remaining sites of the coordination octahedron of this atom are taken up by water molecules. The second Ni atom is coordinated by four carbonyl O atoms belonging to four benzenetetracarboxylate ligands [Ni-O 2.045  (3), 2.069  (3)  Å]; its coordination sphere also includes two water molecules. Each tetraanionic benzenetetracarboxylate ligand links together six Ni atoms, the linkages giving rise to a three-dimensional network motif. The structure is consolidated by hydrogen bonds involving coordinated as well as uncoordinated water molecules.

Online 5 September 2003

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