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From the reaction between (SCN) 2  and Snl 4  a compound is formed the formula of which is ISn(NCS) 3  · I 2 , in which I 2  molecules form charge-transfer complexes with thiocyanate groups. ISn(NCS) 3  can be isolated from this compound. Both compounds were characterised by means of elemental analyses and UV-visible, IR and  119 Sn Mossbauer spectra, and a polymer structure with thiocyanate bridges was deduced. The equilibrium constant was calculated for the reaction: ISn(NCS) 3  · I 2 (solid)+CS 2  ⇌ ISn(NCS) 3 (solid) + I 2 (solution) K = 2.2±0.3 x 10 -3  mol l -1  and it was found that the two solid compounds form a single phase. SnBr 4  forms an unstable addition compound with (SCN) 2 , which decomposes even below 0 °C.

Reactions of (SCN) 2 with SnX 4 (X = Br, I)