Two new sulfide complexes of tin have been prepared by the reaction of styrene sulfide with novel tin(II) amidinate complexes. These compounds exhibit two very different bonding modes for the sulfide ligand; in one case, S=Sn(CyNC((t)Bu)NCy)(2) (3), a terminal Sn=S moiety was found while in the other case, [(CyNC(Me)NCy)(2)Sn-(mu-S)](2) (4), a bridging sulfide dimer is observed. The starting complexes were prepared by the reaction of 2 equiv of the appropriate lithium amidinate with SnCl2 to yield the new species Sn(CyNC(R)NCy)(2) [Cy = cyclohexyl; R = Me (1); R = (t)Bu (2)]. This account represents the first report of (CyNC((t)Bu)NCy)(-) and the coordination chemistry of this bulky ligand. Spectroscopic and elemental analyses confirmed the formulas of all of these new species. Compounds 2, 3, and 4 were further characterized by X-ray crystallography. Compound 2 possesses a coordination geometry based on a trigonal bipyramid with one equatorial vertex occupied by the stereochemically active lone pair of electrons. Crystal data for 2 : monoclinic, P21/c, a = 18.944(5) Angstrom, b = 10.604(2) Angstrom, c = 19.423(2) Angstrom, beta = = 95.99(1)degrees, Z = 4, R = 0.046, R(w) = 0.049. Crystal data for 3 : orthorhombic, Cmcm, a = 12.3788(23) Angstrom, b = 14.1977(15) Angstrom, c = 20.670(3) Angstrom, Z = 4, R = 0.057, R(w) = 0.070. Crystal data for 4 : monoclinic, P2/n, a = 13.0395(2) Angstrom, b = 13.0263(2) Angstrom, c = 23.8856(2) Angstrom, beta = 95.719(3)degrees, R = 0.055, R(w) 0.044.