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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 tetra­hedra, 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 inter­actions link the components into a three-dimensional network and additional stabilization is provided by weak C—H⋯O hydrogen bonds.

In the title salt, (C12H20N2)[CuCl4], the CuII atom occupies a general position in a flattened tetra­hedral environment by Cl ligands, characterized by Cl—Cu—Cl angles of 134.04 (3) and 137.18 (4)°. The six-membered piperazinediium ring adopts a chair conformation. The organic cation and inorganic anion inter­act through N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming a three-dimensional network.

A novel tetrachlorocuprate salt (C6H16N2O)[CuCl4] was synthesized and its crystal structure determined by single crystal X-ray diffraction analysis. This compound crystallizes in the monoclinic space group Pn with unit cell parameters a = 7.71302(11), b = 6.33580(8), c = 13.10453(19)Å, = 104.9526(15)°, V = 618.710(15)Å3 and one cation and one anion in the asymmetric unit. Its crystal structure consists of [CuCl4]2-anions surrounded by [C6H16N2O]2+ cations. NHCl, NHO and OHCl hydrogen bonding interactions link the entities into a three-dimensional framework. Theoretical calculations at the DFT/B3LYP/LanL2DZ level of theory provided good consistency between the calculated and experimental vibrational spectra and with the observed geometries of the ions. Compared with reference drugs, the compound exhibited moderate activity against gram-negative bacteria, while it showed modest activity against fungal and the gram-positive strains, except for S. aureus.

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