Poly[di-μ2-aqua-μ2-(5-methylpyrazine-2-carboxylato)-(5-methylpyrazine-2-carboxylato)-μ3-nitrato-trilithium]

The asymmetric unit of the title compound, [Li3(C6H5N2O2)2(NO3)(H2O)2]n contains three LiI ions, two ligand anions, two water molecules and a nitrate anion. Related by a centre of inversion, they form a centrosymmetric molecular cluster in which one of the LiI ions shows trigonal–bipyramidal and the other two distorted tetrahedral coordination. LiI ions are bridged by water O atoms and carboxylate O atoms donated by one of the ligands. The clusters, bridged by two nitrato O atoms, form molecular columns along [010], which are held together by O—H...O and O—H...N hydrogen bonds and π–π interactions [centroid–centroid distances = 3.694 (1) and 3.796 (1) ].