A mononuclear complex, cis-[meso-1, 3-bis(propylsulfinyl)propane]- dichloroplatinum(Ⅱ) (Pt(C9H20O2S2)Cl2) 1, has been prepared and structurally characterizated by single-crystal X-ray diffraction. The crystal belongs to orthorhombic system, space group Pna21 with a = 22.800(3), b = 11.7662(13), c = 5.8115(6) ? V = 1559.0(3) ?, Mr = 490.36, Dc = 2.089 g/cm3, Z = 4, F(000) = 936, m (MoKa) = 9.596 mm-1 and l = 0.71073 ? The structure was refined to R = 0.0204 and wR = 0.0473 for 2703 reflections with I > 2(I). It is revealed that the central Pt(Ⅱ) ion in the title complex is bonded to two Cl atoms in a cis-configuration and two S atoms of the ligand to form the coordination geometry deviating slightly from the square planar. A mononuclear complex, cis- [meso-1, 3-bis (propylsulfinyl) propane] -chloroplatinum (II) (Pt (C9H20O2S2) Cl2) 1, has been prepared and structurally characterizated by single-crystal X-ray diffraction (3), Mr = 490.36, Dc = 2.089 g / cm3, Z = 23.800 (3), b = 11.7662 (13), c = 5.8115 = 4, F (000) = 936, m (MoKa) = 9.596 mm-1 and l = 0.71073? The structure was refined to R = 0.0204 and wR = 0.0473 for 2703 reflections with I> 2 that the central Pt (II) ion in the title complex is bonded to two Cl atoms in a cis-configuration and two S atoms of the ligand to form the coordination geometry deviating slightly from the square planar.