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The structure of the title compound, [Li 2 (C 8 H 2 N 2 O 8 )(H 2 O) 4 ]·H 2 O, is composed of dinuclear mol­ecules in which the ligand bridges two symmetry-related Li I  ions, each coordinated also by two water O atoms, in an  O , N , O ′-manner. The Li and N atoms occupy special positions on twofold rotation axes, whereas a crystal water mol­ecule is located at the inter­section of three twofold rotation axes. The Li I  cation shows a distorted trigonal–bipyramidal coordination. Two carboxyl­ate groups remain protonated and form short inter­ligand hydrogen bonds. The mol­ecules are held together by a network of hydrogen bonds in which the coordinating and solvation water mol­ecules act as donors and carboxyl­ate O atoms as acceptors, forming a three-dimensional architecture.

acta crystallographica. section e

(μ-Dihydrogen pyrazine-2,3,5,6-tetracarboxylato-κ6O2,N1,O6;O3,N4,O5)bis(diaqualithium) monohydrate