Source of materialAm ixture of CaCl 2 (0.5 mmol, 0.05 g) and 2-ethyl-1H-imidazole-4,5-dicarboxylic acid (0.5 mmol, 0.95 g) in 15 ml of H 2 Osolution was sealed in an autoclave equipped with aTeflonlined stainless steel vessel (25 ml) and then heated at 373 Kfor 3d ays. Crystals of the title compound were obtained by slow evaporation of the solvent at room temperature. Experimental detailsCarbon and nitrogen bound hydrogen atoms were placed at calculated positions and treated as riding on the parent atoms with In the title complex, the Ca II cation is eight-coordinated (N2O6), with two chelating rings from N,O-bidentate 2-ethyl-1H-imidazole-4,5-dicarboxylate anions, two carboxylate Oa toms from another two 2-ethyl-1H-imidazole-4,5-dicarboxylate anions, and two coordinated water molecules, generating a slightly distorted square-antiprismatic coordination. The Ca-N bond distances are both 2.584(2) Å,and the Ca-Obond lengths vary from 2.412(2) Å to 2.539(1) Å.The Ca II centres are interconnected by the ligands, whereby the ligand is functioning as tridentate and bridges Ca atoms into an infinite two-dimensional layer constructed of Ca 4 squares, the edge distances of the quasisquare are of 9.0568(9) Å and the angles are 85.090(1)°and 94.910(5)°,r espectively. The layers are further linked into a three-dimensional network by an extensive number of hydrogen bonds involving the coordinated water molecules and the 2-ethyl-1H-imidazole-4,5-dicarboxylate ligands.
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