Abstract
Investigations have been made to establish how far the methyl group reorientation in alkanes in the temperature range from −160°C to −25°C can be described by means of a classical hindered rotation. To this end, the spin-lattice relaxation times of 3 undeuterated alkanes have been measured as a function of the temperature. The relaxation curves have been compared with those for alkanes of the same chain length in which in one methyl group one proton was replaced by a deuterium nucleus. The measured relaxation time minimum of a reorienting CH 2D-group was found to be in agreement with the value calculated theoretically. The symmetry of the spin-lattice relaxation curve of the CH 2D-group and the observed slight shift of the relaxation time minimum on replacement of one H proton by one deuterium nucleus in a CH 3 group show that the effect of CH 3 reorientation on the relaxation in the temperature range considered can be described in a classical way.
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