| Abstract | Benzene and thiophene are known to form solid solutions over the entire composition range; the present work demonstrates the orientational freedom of thiophene molecules in solid solution with excess perdeuterobenzene, through measurements of spin–lattice relaxation times. In addition, the atom–atom approximation to intermolecular forces yielded a potential energy profile for in-plane rotation of a thiophene molecule, embedded in a benzene lattice, which is consistent with the experimental activation energy for the relaxation. The second moment of the absorption signal for thiophene in perdeuterobenzene at 80 K was determined to be 0.66 G2, compared with a value of 0.42 G2 computed as the intramolecular contribution only for in-plane rotation. |
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