A new layered zinc-phosphate Zn(HPO4)Cl.[H3N(CH2)(6)NH3](0.5) was synthesized in acidic conditions at room temperature. It crystallizes in monoclinic space group C2/c (No. 15) with the lattice parameters a = 21.826(3) Angstrom, b = 9.452(7) Angstrom, c = 8.780(1) Angstrom, beta = 109.36(8)degrees, V = 1708.83(1) Angstrom(3), Z = 8, R = 0.036, R-w = 0.047. The structure of this compound is determined by X-ray diffraction and characterized with IR, TGA-DTA/DSC and NMR. The structure consists of inorganic layers, built by PO4 and ZnO3Cl tetrahedra interconnected by common oxygen atoms. The organic entities, located between these layers, perform the 3D cohesion through N-(HO)-O-... or N-(HCl)-Cl-... hydrogen bonds. (C) 2004 Elsevier Ltd. All rights reserved.