Reaction of bis(dichlorophenylstannyl)propane (PhCl2Sn)2(CH2)3 with Na2S gives the dimeric compound [(PhSSn)2(CH2)3]2 (1) which has been shown by X-ray crystallography to contain six-membered SnC3SnS rings as well as eight-membered Sn4S4 rings. NMR studies show that 1 is stable in toluene solution with the same structure as that in the solid state, but addition of chloride ion brings about exchange