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The structure of the title compound, [Li(C(6)H(3)N(2)O(4))(2)(H(5)O(2))], is composed of centrosymmetric monomers in which an Li(I) ion is chelated by two N,O-bonding groups donated by two ligands. The Li(I) ion and both ligand mol-ecules are coplanar [r.m.s. deviation 0.0047 (2) Å] and water O atoms are in the axial positions. The second carboxyl group of each ligand remains protonated. An additional H atom, located between adjacent coordinated water mol-ecules and observed on Fourier maps, maintains the charge balance within the monomers and bridges them by short symmetric hydrogen bonds of 2.518 (3) Å to form catenated ribbons. The monomers also inter-act via hydrogen bonds in which water and carboxyl O atoms act as donors.

Bis[[(6-carboxypyridazine-3-carboxylato-κ2N2,O3)lithium]-μ-pentahydrogendioxygen(1+)]

Bis[[(6-carboxypyridazine-3-carboxylato-κ²N²,O³)lithium]-μ-pentahydrogendioxygen(1+)]