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Acta Cryst. (2013). E69, m655-m656
[ doi:10.1107/S1600536813030493 ]

catena-Poly[[aqua­lithium(I)]-[mu]-3-carb­oxy-5,6-di­methyl­pyrazine-2-carboxyl­ato-[kappa]4O2,N1:O3,N4]

W. Starosta and J. Leciejewicz

Abstract: The asymmetric unit of the title compound, [Li(C8H6N2O4)(H2O)]n, comprises three Li cations, two of which are located on a twofold rotation axis, two carboxylate anions and three water mol­ecules, of which two are situated on the twofold rotation axis being aqua ligands. Both carboxylate anions are in [mu]2-bridging mode. All Li ions show a trigonal-bipyramidal coordination mode; the two located in special positions are bridged through N,O-bonding sites generating a polymeric ribbon along the c-axis direction. The Li cation in a general position creates an independent polymeric ribbon through N,O-bonding sites of the two symmetry-related ligands; the trigonal-bipyramidal coordination is completed by an aqua ligand. In both carboxylate anions, a carboxyl­ate and a carb­oxy­lic acid group form an intra­molecular hydrogen bond. The polymeric ribbons running along [001] are inter­connected by hydrogen bonds in which the water mol­ecules act as donors and carboxyl­ate O atoms act as acceptors, giving rise to a three-dimensional architecture.


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