Poly[Triaquabis(μ(2)-3-Carboxypyrazine-2carboxylato)dilithium(I)]

Abstract

In the title compound, [Li2(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-carboxy-pyrazine-2-carboxyl-ate ligand, two O atoms from two water mol-ecules, and an N and a carboxyl-ate O atom of a second 3-carboxy-pyrazine-2-carboxyl-ate ligand. The other Li+ ion also has a distorted trigonal-bipyramidal geometry, coordinated by one water mol-ecule and two 3-carboxy-pyrazine-2-carboxyl-ate ligands through an N and a carboxyl-ate O atom from each. One of the carboxyl groups of the two ligands takes part in an intra-molecular O - H⋯O hydrogen bond. The stabilization of the crystal structure is further assisted by O - H⋯O, O - H⋯N and C - H⋯O hydrogen-bonding inter-actions involving the water mol-ecules and carboxyl-ate O atoms.