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The amplitude and temperature dependence of the longitudinal proton spin relaxation time T 1  in crystalline 1-hydroxy-2,4-hexadiyne is caused by the activated process of the CH 3 -group reorientation. The low hindering barrier of 4.4 kj/mole leads above 200 K to relaxation contributions by spin-rotational interaction, which are comparable to the dipolar interaction

Proton Spin-Rotational Interaction in Crystalline 1-Hydroxy-2,4-Hexadiyne