COPPER-DILITHIUM-(BIS)GUANIDINIUM CYCLOHEXAPHOSPHATE TETRAHYDRATE

We report chemical preparation and crystal structure for a new type of cyciohexaphosphate arrangement, CuLi2[C(NH2)3]2P6O18.4H2O. This mixed salt is triclinic, with Z = 1, and the following unit-cell dimensions : a = 9.455(3), b = 9.211(4), c = 7.503(4) angstrom alpha = 108.17(5), beta = 109.56(5), gamma = 84.72(4)degrees. Space group is P1BAR. The main feature of this arrangement is the existence of a three-dimension al inorganic network built by P6O18 groups, LiO4 tetrahedra and CuO6 o ctahedra arranged as to create, parallel to the c direction, very larg e channels containing the organic entities. Crystal structure was solv ed by using 3160 reflections, with a final R value of 0.024. Half of t he water molecules are not involved in the associated cation coordinat ion polyhedra. The hydrogen-bond scheme is described.