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The longitudinal proton relaxation time T 1  in methyl naphthalene crystals, differing in the arrangement and number of the substituted CH 3  groups, was measured as a function of the temperature above 77 °K and the magnetic field between 0.9 and 20 kOe. The results can be described by hindered rotation of the methyl groups with the jumping times and activation energies strongly dependent on the group arrangement. In the β-position the rotational barrier of 0.8 kcal/mol is predominantly determined by the infermolecular interaction, whereas in the case of the a-position and for adjacent CH 3 ’s the hindering potential of 2.4 kcal/mol arises largely from the intramolecular term.

Bewegungen der CH 3 -Gruppen in Methyl-Naphthalin-Kristallen: I. Protonen-Spin-Relaxation in kristallinen Methyl-Derivaten des Naphthalins