Poly[di-μ(2)-aqua-μ(2)-(5-methyl­pyrazine-2-carboxyl­ato)-(5-methyl­pyrazine-2-carboxyl­ato)-μ(3)-nitrato-trilithium]

The asymmetric unit of the title compound, [Li(3)(C(6)H(5)N(2)O(2))(2)(NO(3))(H(2)O)(2)](n) contains three Li(I) 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 Li(I) ions shows trigonal–bipyramidal and the other two distorted tetra­hedral coordination. Li(I) 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) Å].