The synthesis and structure of the NiII complex of 1,10-phenanthroline-2,9-dicarboxylate: a three-dimensional network via hydrogen bonding interactions

A new NiII complex, [Ni(L)(H2O)3]·H2O (L=1,10-phenanthroline-2,9-dicarboxylate), has been synthesized and structurally determined by X-ray diffraction analysis. The complex crystallizes in monoclinic system, space group P2(1)/c, a=9.667(4), b=21.929(9), c=7.262(3) Å, β=95.395(7)° and Z=4. In this complex, each metal center adopts an octahedral geometry formed by two N atoms of a ligand L and four O atoms from three H2O molecules and a carboxyl of the ligand. Each ligand adopts N,N,O-tridentate coordination mode with two N atoms and an O atom chelating a NiII center to form a mononuclear molecule. Intermolecular strong O-H⋯O and weak C-H⋯O hydrogen bonds extend the mononuclear structure into a three-dimensional supramolecular architecture.