Acta Cryst. (2009). E65, m1704-m1705  [ doi:10.1107/S1600536809050570 ]

Poly[-aqua-diaqua(₂-pyrazine-2,3-dicarboxylato)dilithium(I)]

M. Tombul and K. Guven

Abstract: The asymmetric unit of the title compound, [Li₂(C₆H₂N₂O₄)(H₂O)₃]_n, consists of two independent Li⁺ cations, one pyrazine-2,3-dicarboxylate dianion and three water molecules. One of the Li⁺ cations has a distorted tetrahedral geometry, coordinated by one of the carboxylate O atoms of the pyrazine-2,3-dicarboxylate ligand and three O atoms from three water molecules, whereas the other Li⁺ cation has a distorted trigonal-bipyramidal geometry, coordinated by a carboxylate O atom of a symmetry-related pyrazine-2,3-dicarboxylate ligand, two water molecules and a chelating pyrazine-2,3-dicarboxylate ligand (by utilizing both N and O atoms) of an adjacent molecule. The synthesis of a hydrated polymeric dinuclear lithium complex formed with two pyrazine-2,3-dicarboxylic acid ligands has been reported previously [Tombul et al. (2008a). Acta Cryst. E64, m491-m492]. By comparision to the complex reported here, the dinuclear complex formed with two pyrazine-2,3-dicarboxylic acid ligands differs in the coordination geometry of both Li atoms. The crystal structure further features O-HO and O-HN hydrogen-bonding interactions involving the water molecules and carboxylate O atoms.

Online 28 November 2009

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