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The unit cell of the title compound, (N(2)H(5))(2)[Li(2)(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·[Li(4)(C(6)H(2)N(2)O(4))(2)(H(2)O)(8)], comprises two centrosymmetric complexes, one double negatively charged and one neutral, and two mono-protonated hydrazine cations. The anionic complex molecule is a dimer, built of a pair of symmetry-related pyridazine-3,6-dicarboxyl-ate ligands and a pair of Li(I) ions, each coordinated by two N,O-chelating sites donated by a ligand mol-ecule and an aqua O atom at the apical position. The penta-coordination around the Li(I) ions is partway between a trigonal-bipyramidal and a square-pyramidal arrangement. The two carb-oxy-lic acid groups of the ligand are deprotonated and one carboxyl-ate O atom of each group is not involved in the coordination, and this applies to both the anionic and the neutral complex. The neutral complex molecule is also composed of a pair of Li(I) ions and a pair of ligand mol-ecules related by a centre of symmetry. They form a dimeric core in which the penta-coordination of the Li(I) ions includes two N,O-bonding groups donated by two ligands and an aqua O atom. The penta-coordination is described as partway between a trigonal-bipyramidal and a square-pyramidal arrangement. The coordinated carboxyl-ate group is bidentate-bridging, forming with an Li(H(2)O)(3) unit a neutral tetra-meric mol-ecule. The coordination of the tetra-coordinated Li(I) ion shows a slightly distorted tetra-hedral geometry. An extended system of O-H⋯O and N-H⋯O hydrogen bonds contributes to the stability of the crystal structure.

acta crystallographica. section e

Bis(hydrazin-1-ium) bis(μ<sub>2</sub>-pyridazine-3,6-dicarboxylato)bis(aqualithiate) octaaquabis(μ<sub>3</sub>-pyridazine-3,6-dicarboxylato)tetralithium

Bis(hydrazin-1-ium) bis(μ2-pyridazine-3,6-dicarboxylato)bis(aqualithiate) octaaquabis(μ3-pyridazine-3,6-dicarboxylato)tetralithium

Bis(hydrazin-1-ium) bis(μ₂-pyridazine-3,6-dicarboxylato)bis(aqualithiate) octaaquabis(μ₃-pyridazine-3,6-dicarboxylato)tetralithium