Tris(1,10-phenanthroline-κN,N')nickel(II) bis-(2,4,5-tricarb-oxy-benzo-ate) monohydrate.

In the title compound, [Ni(C(12)H(8)N(2))(3)](C(10)H(5)O(8))(2)·H(2)O, the Ni(II) cation is coordinated by six N atoms of the three bidentate chelating 1,10-phenanthroline ligands in a slightly distorted octa-hedral coordination geometry. The Ni-N bond lengths range from 2.074 (2) to 2.094 (2) Å. The dihedral angles between the three chelating NCCN groups to each other are 85.71 (3), 73.75 (2) and 85.71 (3)°, respectively. The Ni cation, the phenyl ring of the 1,10-phenanthroline ligand and the lattice water molecule are located on special positions (site symmetry 2). In the crystal, the uncoordinated 2,4,5-tricarb-oxy-benzeno-ate anions join with each other through O-H⋯O hydrogen bonds, forming a two-dimensional hydrogen-bonded layer structure along the bc plane. The layers are further linked via additional O-H⋯O inter-actions between water and carboxyl groups, resulting in a three-dimensional supra-molecular network.