Two new Sn(II) phosphate materials, I and II, have been synthesized hydrothermally using 1,3-diaminopropane and 1,3-diamino-2-hydroxypropane as structure-directing organic amines. The solids I and II have layered architectures and are isostructural. The structures consist of vertex sharing trigonal-pyramidal SnO ₃ and tetrahedral PO ₄ moieties forming infinite layers possessing 4- and 8-membered apertures. The interlamellar space is occupied by the protonated amine molecules which interact with the framework through hydrogen bonding. Crystal data for compound I: [NH ₃ (CH ₂ ) ₃ NH ₃ ] ²⁺ 2[SnPO ₄ ] ^– , M=501.9, monoclinic, space group C2/c, a=18.097(1), b=7.889(1), c=9.151(1) Å β=111.84(1)°, V=1212.6(2) Å ³ , Z=4, R=0.033 and R _w =0.061 [791 observed reflections with I=2σ(I)]; compound II [NH ₃ (CH ₂ CHOHCH ₂ )NH ₃ ] ²⁺ 2[SnPO ₄ ] ^– , M=517.9, monoclinic, space group C2/c, a=18.133(1), b=7.858(1), c=9.344(1) Å, β=111.3(1)°, V =1240.5(2) Å ³ , Z=4, R=0.040 and R _w =0.11 [867 observed reflections with I=2σ(I)].