Research Article: Diaqua­bis­(4-carb­oxy-2-ethyl-1H-imidazole-5-carboxyl­ato-κ2N3,O4)cadmium dihydrate

Date Published: July 01, 2011

Publisher: International Union of Crystallography

Author(s): Gang Zhang, Yong Wang.


The asymmetric unit of the title compound, [Cd(C7H7N2O4)2(H2O)2]·2H2O, consists of one CdII ion, one 4-carb­oxy-2-ethyl-1H-imidazole-5-carboxyl­ate anion, one coordinated water mol­ecule and one lattice water mol­ecule. The CdII ion lies on a twofold axis, and is hexa­coordinated by four O atoms from water mol­ecules and carboxyl­ate groups and two N atoms from two imidazole rings, in a distorted octa­hedral arrangement. An extensive framework of N—H⋯O and O—H⋯O hydrogen bonds with the participation of coordinated and free water mol­ecules is found in the crystal structure, which contributes to the formation of a three-dimensional structure.

Partial Text

For coordination polymers built up from related imidazole–carboxyl­ate ligands, see: Li et al. (2011 ▶); Wang et al. (2008 ▶); Zhang et al. (2010 ▶); Tian et al. (2010 ▶). For a related CdII complex based on the ligand 5-carb­oxy-2-methyl-1H-imidazole-4-carboxyl­ate, see: Nie et al. (2007 ▶).




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