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Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements

B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)

Abstract

It was possible to specify the motional mechanisms, which are effective in the high‐temperature modifications (B,C,D) of n‐C33H68, using NMR and ir measurements in connection with the previously reported x‐ray experiments. Modification B is characterized by the occurrence of coupled rotational jumps with amplitudes of about 180 degrees. In modification C flip‐flop screw motions are superimposed. Passing to modification D, intramolecular defects appear, which diffuse along the chains. At the same time the rotational component of motion changes to a more continuous and less jumplike form.

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