A new zinc phosphate of the formula, [NH 3 (CH 2 ) 3 NH 3 ][Zn 4 (PO 4 ) 2 (HPO 4 ) 2 ], has been synthesized hydrothermally starting from a zinc amine complex. It crystallizes in the monoclinic space group C2/c; a=17.279(1), b=5.193(1), c=20.115(1) 9, β=92.6(1) o ; V=1803.1(2) 9 3 ; Z=4; D c a l c =2.05 g cm - 3 ; μ (MoKα)=5.62 mm - 1 . The final R, and wR 2 =0.037, 0.093 obtained for 136 observed data [I>2σ(I)]. The structure consists of macroanionic sheets of interconnected ZnO 4 and PO 4 tetrahedra in the ab plane. The sheets are held together by hydrogen bond interactions with the organic structure-directing amine, forming alternate inorganic-organic layers in this material. Hydrogen bond interactions between the inorganic layers, via the terminal -OH group, leads to the formation of pseudo one-dimensional channels.