2-PI 3 ME3SN PROPELLER-LIKE JUMPS IN SOLID BIS(TRIMETHYLTIN) DIMESYLAMIDE HYDROXIDE, [ME3SN(MU-(MESO2)2N)ME3SN(MU-OH)]N/

Rates and activation energies of 2pi/3 propeller-like jumps for the tw o inequivalent Me3Sn sites in solid crystalline [Me3Sn{mu-MeSO2)2N}Me3 Sn(mu-OH)], 1, as obtained from variable temperature one- and two-dime nsional C-13 CP/MAS NMR, are discussed in comparison to the single cry stal X-ray structure of 1 at 296 and 178 K and in conjunction with for ce field considerations (atom-atom potential energy barrier calculatio ns). The combined results allow assignment of the two resonances in th e Sn-119 CP/MAS spectra of 1 to the specific molecular Me3Sn sites in 1 and give evidence as to what structural features in 1 are responsibl e for the two different energy barriers of the observed 2pi/3 Me3Sn pr opeller-jump processes.