deals with crystal structure determination and physico-Physicochemical properties of the bis[1-(2-ammoniumethyl) chemical properties of a new organic cyclohexaphosphate piperazinium] cyclohexaphosphate hexahydrate are discussed prepared with the same interaction route. The linear oron the basis of X-ray crystal structure investigation. ganic molecule is replaced by a polarizable cyclic organic [C 6 H 18 N 3 ] 2 P 6 O 18 Ψ 6H 2 O is triclinic, P1, with a β«Ψβ¬ 9.714(2) A Λ, cation inducing an isotropic crystal growth which reflects b β«Ψβ¬ 10.538(2) A Λ, c β«Ψβ¬ 8.095 A Λ, β£ β«Ψβ¬ 87.88(2)Ψ, β€ β«Ψβ¬ 93.48(2)Ψ, the role played by the strong three-dimensional hydrogen-β₯ β«Ψβ¬ 83.20(1)Ψ, and Z β«Ψβ¬ 1. The structure has been solved using bond network. direct methods and refined to a reliability R factor of 0.0307 for 2291 reflections. The compound is characterized by infinite II. CRYSTAL CHEMISTRY layers of inorganic polyanions approximately parallel to the (0 0 1) planes. Organic cations are sandwiched between these II.1. Chemical Preparation layers. OW-H Ψ Ψ Ψ O and N-H Ψ Ψ Ψ O hydrogen bonds link P 6 O 18 groups, respectively, in a layer and in successive layers as to Most of the well characterized organic cyclohexaphosbuild a framework in a three-dimensional way. Two water phates were prepared in two steps: (i) a dilute solution of molecules leave this compound at room temperature giving cyclohexaphosphosphoric acid (0.035 M/liter) was prea stable tetrahydrate phase. The structure reorganization is pared from 12 g of Li 6 P 6 O 18 using ion-exchange resins discussed on the basis of OW H-bonds by TG-DTA and DSC (Amberlite IR 120), and (ii) the acid produced is immedithermal analyses. The reported IR study is supported by a ately neutralized by the stoichiometric amount of 1-(2detailed theoretical group analysis applied to P 6 O 18 with D 6h aminoethyl) piperazin (6 cm 3 , density 0.981). Schematically ideal local symmetry.