Date Published: March 01, 2012
Publisher: International Union of Crystallography
Author(s): Changfu Zhuang, Ning Li, Xiao-yang Yu.
The asymmetric unit of the title compound, [Ni2(C10H2O8)(C12H8N2)2(H2O)4]·0.67H2O, contains one complete binuclear complex and one half-molecule, the latter being completed by crystallographic inversion symmetry, and 0.67 of a solvent water molecule. Each Ni2+ cation is coordinated by a 1,10-phenanthroline ligand, a bidentate benzene-1,2,4,5-tetracarboxylate (btec) tetra-anion and two water molecules to generate a distorted cis-NiN2O4 octahedral coordination geometry. The btec species bridges the metal ions. In the crystal, the clusters and uncoordinated water molecules are linked by O—H⋯O hydrogen bonds and π–π interactions [shortest centroid–centroid separation = 3.596 (2) Å] to form a three-dimensional network.
For btec as a ligand in coordination chemistry, see: Lu et al. (2005 ▶).