Experimental

R factor = 0.057; wR factor = 0.151; data-to-parameter ratio = 14.5. The crystal structure of the title compound, [Li2(C4H2N3O4)2-(H2O)4], contains centrosymmetric dinuclear molecules in which two LiI ions are bridged by two water O atoms. The metal ion is coordinated by one N,O-bidentate ligand and three water O atoms (one of them is symmetry generated), with one of the bridging water O atoms in the apical position of a distorted square pyramid. The carboxylate group that participates in coordination to the metal ion remains protonated; the other is deprotonated and coordination inactive. An intramolecular O—H O hydrogen bond between carboxylate groups is observed. In the crystal, dimers are linked by O—H O, O—H N and N—H O hydrogen bonds, generating a three-dimensional network. Related literature For the structures of Co and Ni complexes with the 1,2,3-trizole-4,5-dicarboxylate ligand, see: Tong et al. (2011)