Three-Dimensional Hydrogen Bonding Framework in the Crystal Structure of a Zinc(II) Complex of Imidazole Multicarboxylic Acid

Abstract

An new compound, [Zn(H₂EIDA)₂(H₂O)]·DMF (1), (H₂EIDA = deprotonated 2-ethyl-4H-imidazole-4,5-dicarboxylic acid, DMF = N,N-dimethylform amide), has been synthesized and structurally characterized. Compound 1 crystallizes in monoclinic space group C2/c, an asymmetric unit contains one zinc ion, which is situated on a center of inversion, two crystallographically dependent deprotonated H₂EIDA⁺ ligands, one coordinated water molecule and one DMF molecule. The Zn(II) ion is five-coordinated exhibiting distorted trigonal-bipyramidal geometry. The 1D chain was formed by H-bonding and O···O interactions between monodeprotonated H₂EIDA⁺ ligand and DMF molecule, and bifurcated hydrogen bonding interactions link the 1D chain to form 3D framework.

Keywords:

• 2-ethyl-4H-imidazole-4
• 5-dicarboxylic acid
• crystal structure
• hydrogen bonds; O···O interactions

Acknowledgments

The authors thank the Natural Science Foundation (Grant Nos.: 21171097) and Postdoctoral Science Foundation (Grant Nos.: 20110491403) of china for financial support.