Received 9 March 2011
aCollege of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, People's Republic of China,bCollege of Science, Guangdong Ocean University, Zhanjiang 524088, People's Republic of China, and cCollege of Agriculture, Guangdong Ocean University, Zhanjiang 524088, People's Republic of China
Correspondence e-mail: firstname.lastname@example.org
In the title compound, C7H8N2O4·H2O, the imidazole N atom is protonated and one of the carboxylate groups is deprontonated, forming a zwitterion. The two carboxyl groups are are approximately coplanar with the imidazole ring [O-C-C-C torsion angles = -176.8 (2) and 2.9 (4)° for one group and -4.6 (3) and 176.4 (2)° for the other] and have an intramolecular O-HO hydrogen bond between them. The water molecule is linked to the organic molecules via an N-HO hydrogen bonds. Intermolecular O-HO and N-HO hydrogen bonds are found in the crystal structure.
For our past work based on the 2-propyl-1H-imidazole-4,5-carboxylate (H3pimda) ligand, see: Yan et al. (2010); Li et al. (2010); Song et al. (2010); He et al. (2010); Fan et al. (2010). For related coordination polymers based on H3EIDC (2-ethyl-1H-imidazole-4,5-dicarboxylate), see: Wang et al. (2008); Zhang et al. (2010); Li et al. (2011). For the synthesis of H3EIDC, see: Sun et al. (2006).
Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: JH2272 ).
The work was supported by the Nonprofit Industry Foundation of the National Ocean Administration of China (grant No. 2000905021), the Guangdong Ocean Fisheries Technology Promotion Project [grant No. A2009003-018(c)], the Guangdong Chinese Academy of Science Comprehensive Strategic Cooperation Project (grant No. 2009B091300121), the Guangdong Province Key Project in the Field of Social Development [grant No. A2009011-007(c)], the Science and Technology Department of Guangdong Province Project (grant No. 00087 061110314018) and the Guangdong Natural Science Foundation (No. 9252408801000002).
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