Date Published: June 01, 2011
Publisher: International Union of Crystallography
Author(s): Gang Zhang.
In the crystal structure of the title compound, [Zn(C7H7N2O4)2(H2O)2]·3H2O, the ZnII ion, located an inversion center, is N,O-chelated by two 5-carboxy-2-ethyl-1H-imidazole-4-carboxylate anions and further coordinated by two water molecules in a distorted octahedral geometry. The carboxy group links with the carboxylate group of the same ligand via an intramolecular O—H⋯O hydrogen bond. An extensive intermolecular N—H⋯O and O—H⋯O hydrogen-bonded network exists in the crystal structure. One disordered lattice water molecule is half-occupied and is located close to an inversion center.
For coordination polymers built from 2-ethyl-4,5-imidazoledicarboxylate, see: Li et al. (2011 ▶); Wang et al. (2008 ▶); Zhang et al. (2010 ▶).