(μ-Di­hydrogen pyrazine-2,3,5,6-tetra­carboxyl­ato-κ(6) O (2),N (1),O (6);O (3),N (4),O (5))bis­(di­aqua­lithium) monohydrate

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.