Nuclear Magnetic Resonance Investigation of Possible Molecular Motion in Coronene, Perlene, and Triphenlene in the Solid State

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Abstract
Broad-line nuclear magnetic resonance (n.m.r.) and spin lattice relaxation time measurements on solid coronene indicate the presence of a molecular reorientation process at 160 °K. The activation energy for the process has been determined at 5.9 kcal/mol and the nature of the motion deduced as being reorientation in the plane of the molecule. No motional processes are observed for perylene or triphenylene.The results are discussed with respect to thermodynamic data and the molecular structures.

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