Date Published: July 01, 2011
Publisher: International Union of Crystallography
Author(s): Chao-Jun Du, Zheng-Hai Shi, Li-Sheng Wang, Chao-Ling Du.
In the title compound, C8H10N2O4·H2O, the imidazole N atom is protonated and one of the carboxylate groups is deprotoned, forming a zwitterion. An intramolecular O—H⋯O hydrogen bond occurs. The crystal structure is stabilized by intermolecular N—H⋯O and O—H⋯O hydrogen bonds. In addition, intermolecular N—H⋯O and O—H⋯O hydrogen bonds link the molecules into two-dimensional networks parallel to (10).
For the use of related imidazoledicarboxylic acid structures in coordination chemistry, see: Sun et al. (2006 ▶); Merchan & Stoeckli-Evans (2007 ▶); Guo (2009 ▶); Wang & Qin (2010 ▶); Wang et al. (2010 ▶); Feng et al. (2010 ▶); Li et al. (2010 ▶). For the synthesis of the title compound, see: Alcalde et al. (1992 ▶).