PREPARATION AND STRUCTURAL CHARACTERIZATION OF [Cd（2-SC5H3NH-3-SiMe3）I2]2

Reaction of cadmium iodide （CdI2） with 3-（trimethylsilyl）-pyri-dine-2-thiol（TSPT ） in methanol yields the title compound. The dimeric complex C16-H26NzSi2S2I4Cdz crystallizes in the monoclinic system, space group P21/n, a = 7. 712 （3）, b = 24. 55（1）, c = 8. 170（1） A,β=95.86（2）°, V = 1539（2） A3, Mr=1099. 12, Z = 2, F（000） =1008, μ= 55.65cm,Dc = 2. 37gcm-3, final R = 0. 046 and Rw = 0. 052 for 1066 observed unique reflections. The molecule with [Cd2I4]0 core has a center symmetry and the TSPT ligand is present as monodentate donor in the neutral thione form , protonated at the pyridine nitrogen. The existence of this structure may be rationalized on the basis of intermolecular hydrogen bonding between the NH proton of the ligand and the terminal iodine atom of the adjacent molecules.