Poly[aqua-(μ(3)-pyridazine-4-carboxyl-ato-κO:O:O')lithium].

The structure of the title compound, Li(C(5)H(3)N(2)O(2))(H(2)O), is composed of centrosymmetric dimers in which two Li(I) ions are bridged by a carboxyl-ate O atom, each donated by a ligand, acting in a bidentate mode. The second carboxyl-ato O atoms bridge the dimers to Li(I) ions in adjacent dimers, forming mol-ecular layers parallel to (001). Each Li(I) ion is coordinated by two bridging carboxyl-ate O atoms, a bridging carboxyl-ate O atom donated by the adjacent dimer and an aqua O atom, resulting in a distorted tetra-hedral coordination geometry. The layers are held together by O-H⋯N hydrogen bonds in which coordinated water O atoms act as donors and ligand hetero-ring N atoms as acceptors.