The following equilibrium has bEPn studied by 119Sn NMR and Mossbauer spectroscopies: The 119Sn Mossbauer spectrum of a solid sample of RSnSnRPh2 at 78 K provided evidence for the presence of thrEP different tin environments. When RSnSnRPh2 dissolves in toluene, a red solution is obtained, and at room temperature, the 119Sn NMR spectrum of this solution shows one broad signal at 6 1517 ppm. This chemical shift is similar to that observed for Sn(C6,H-2-1Bu-4,5,6-Me3)2. On cooling the solution to 233 K, the signal at S 1517 ppm gradually sharpens and al the same time, two new signals appear at 6 246 and 2857 ppm. Each of these new signals shows coupling 7(119Sn-ll7Sn/1I9Sn) = 7237Hz. Cooling further to 213 1C results in the disappearance of the signal at 61517 ppm, and at this point, the solution is grEPn in colour. A colour change from grEPn to red is observed when the solution is warmed up to room temperature. Rationalize these observations.
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