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Acta Cryst. (2014). E70, m172
[ doi:10.1107/S1600536814007223 ]

([mu]-Di­hydrogen pyrazine-2,3,5,6-tetra­carboxyl­ato-[kappa]6O2,N1,O6;O3,N4,O5)bis­(di­aqua­lithium) monohydrate

W. Starosta and J. Leciejewicz

Abstract: The structure of the title compound, [Li2(C8H2N2O8)(H2O)4]·H2O, is composed of dinuclear mol­ecules in which the ligand bridges two symmetry-related LiI 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 LiI 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.

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