Acta Cryst. (2012). E68, m373-m374  [ doi:10.1107/S1600536812008902 ]

Diaquabis(5-carboxy-2-ethyl-1H-imidazole-4-carboxylato-²N³,O⁴)cobalt(II) trihydrate

D.-L. Miao, S.-J. Li, W.-D. Song, S.-W. Tong and S. W. Ng

Abstract: In the title compound, [Co(C₇H₇N₂O₄)₂(H₂O)₂]·3H₂O, the Co^II cation, located on 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. Only one carboxy group of the anion is deprotonated, and the two carboxyl groups of the same anion are linked via an intramolecular O-HO hydrogen bond. One of the lattice water molecules is located on an inversion center, its H atom equally disordered over two positions. One of H atoms of another lattice water molecules is also equally disordered over two sites. Water H atoms and the amino H atom all are involved in an intermolecular hydrogen-bonded network in the crystal.

Online 3 March 2012

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