Poly[bis-(piperazine-1,4-diium) [(μ4-cyclo-hexa-phosphato)dilithium] tetra-hydrate]

In the title compound, {(C4H12N2)2[Li2(P6O18)]·4H2O} n , the phosphate ring anion, located around an inversion center, adopts a chair conformation. Adjacent P6O18 rings are linked via corner-sharing by LiO4 tetra-hedra, generating anionic porous {[Li2(P6O18)](4-)} n layers parallel to (101). The piperazine-1,4-diium cations occupy the pores and develop hydrogen bonds with the inorganic framework. An extensive network of N-H⋯O and O-H⋯O hydrogen-bonding inter-actions link the components into a three-dimensional network and additional stabilization is provided by weak C-H⋯O hydrogen bonds.