The organotin(IV) chlorides R n SnCl 4 -n (n=2, R = n Bu or Ph; and n=3, R= Ph) react with 2-amino-1-cyclopentene-1-carbodithioic acid (ACDA) to give [Ph 2 SnCl(ACDA)] (1), [Ph 2 Sn(ACDA) 2 ] (2), [Ph 3 Sn(ACDA)] (3) and [Bu 2 Sn(ACDA) 2 ] (4). The new complexes have been characterized by elemental analysis, UV-Vis, IR, 1 H NMR, 119 Sn NMR spectroscopy and mass spectrometry. On the basis of 119 Sn NMR data the effective coordination number in solution is five. The structures of 1, 3 and 4 have been confirmed by X-ray crystallography. Crystals of 1 are monoclinic with space group P2 1 /n. The tin environment is distorted trigonal bipyramid with Cl and sulfur atoms in apical positions. Crystals of 3 are orthorombic, P2 1 2 1 2 1 , and the structure is distorted trigonal bipyramid with one sulfur and phenyl in the axial position. Complex 4 crystallizes in the triclinic space group, P1( , and the Sn atom shows extremely irregular octahedral coordination with four S atoms laying in the equatorial plane. In all complexes ACDA coordinates as an anisobidentate ligand and its orientation lends to form a NH•••S intramolecular hydrogen bond. The packing is also stabilized by intermolecular hydrogen bonding.