triclinic space group P1 with Z = 2 (single crystal XRD). The Nd atoms are coordinated by 8 O atoms of two crystallographically independent P6O18 rings. The resulting [Nd(P6O18)2] 9complexes and the water molecules form inorganic layers which are separated by the organic cations in the interlayer space. -(AMRI, O.; ABID*, S.; RZAIGUI, M.; Cryst. Res. Technol. 42 (2007) 9, 930-936; Lab. Chim. Materiaux, Fac. Sci. Bizerte, 7021 Zarzouna, Tunisia; Eng.) -Schramke 44-014