catena-Poly[[μ(2)-aqua-diaqua­bis­(μ(4)-pyridazine-3,6-dicarboxyl­ato)tetra­lithium] monohydrate]

In the polymeric structure of the title compound {[Li(2)(C(6)H(2)N(2)O(4))(2)Li(H(2)O)(2)Li(H(2)O)]·H(2)O}(n), the coordination of two independent Li(I) ions is distorted trigonal–bipyramidal and that of the other two independent Li(I) ions is distorted tetra­hedral. The former two Li(I) ions are bridged by hetero-ring N atoms of two independent pyridazine-3,6-dicarboxyl­ate ligands, making a dimeric moiety. The carboxyl­ato-O atoms of both bidentate ligands bridge the dimers to adjacent independent aqua-coordinated Li(I) ions, forming mol­ecular ribbons. The latter are bridged by ligand carboxyl­ato and aqua O atoms, forming mol­ecular layers parallel to (100) which are held together by an extended system of O—H⋯O hydrogen bonds.