An N.M.R. study of molecular motion in solid trimethylaminegallane

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Abstract
Continuous wave and pulsed 1H N.M.R. data have been obtained for solid H3GaN(CH3)3 over the temperature range 63–300 K. A theoretical expression for the relaxation behaviour of a methyl group in a trimethylamine moeity undergoing various motions has been obtained to aid analysis of the data. We find the activation energy to rotation of the -GaH3 group to be 3·6 ± 0·3 kJ/mole (0·86 ± 0·07 kcal/mole), and to a different motion in the molecule to be 21 ± 2 kJ/mole (5·0 ± 0·5 kcal/mole). In the continuous wave spectra effects due to motion of the -CH3 groups and the whole -NMe3 moeity may be distinguished.