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ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, vol.64, 2008 (SCI-Expanded)
In the title compound, [Li-2(C6H3N2O4)(2)(H2O)(3)](n), the coordination number for both independent Li+ cations is five. One of the Li+ ions has a distorted trigonal-bipyramidal geometry, coordinated by one of the carboxyl O atoms of a 3-carboxypyrazine-2-carboxylate ligand, two O atoms from two water molecules, and an N and a carboxylate O atom of a second 3-carboxypyrazine-2-carboxylate ligand. The other Li+ ion also has a distorted trigonal-bipyramidal geometry, coordinated by one water molecule and two 3-carboxypyrazine-2-carboxylate ligands through an N and a carboxylate O atom from each. One of the carboxyl groups of the two ligands takes part in an intramolecular O-H center dot center dot center dot O hydrogen bond. The stabilization of the crystal structure is further assisted by O-H center dot center dot center dot O, O-H center dot center dot center dot N and C-H center dot center dot center dot O hydrogen-bonding interactions involving the water molecules and carboxylate O atoms.