Dynamic disorder in solid tetrakis(trimethylstannyl)methane, C(SnMe3)(4), investigated by one- and two-dimensional variable-temperature Sn-119 and C-13 NMR spectroscopy

Modes of molecular reorientation in solid tetrakis(trimethylstannyl)methane , C(SnMe3)(4), have been investigated by one- and two-dimensional C-13 and Sn-119 static and magic-angle spinning nuclear magnetic resonance spectrosc opy (NMR) in the temperature range from 150 to 290 K. Spectral lineshape fi tting of one- and two-dimensional Sn-119 NMR experiments shows the pseudo-f ivefold disorder previously observed by single-crystal X-ray diffraction on C(SnMe3)(4) to be dynamic disorder (activation energy E-a congruent to 32 kJ mol(-1)). A dynamic-disorder model where each tin atom in a C(SnMe3)(4) molecule occupies the twenty sites of a nearly perfect pentagonal dodecahed ron with equal probability agrees best with the experimental solid-state NM R results.