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The NMR-spectrum of benzaldehyde partially oriented in the nematic phase

✍ Scribed by P. Diehl; P. M. Henrichs; W. Niederberger

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
367 KB
Volume
3
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The NMR spectrum of benzaldehyde oriented in the nematic phase of a mixture of p‐(p‐ethoxyphenylazo)phenylheptanoate and p‐(p‐ethoxyphenylazo)phenylundecylenate is analysed. It is demonstrated that the data are inconsistent with models in which the aldehyde group freely rotates or has minimum energy when it is perpendicular to the ring plane. The barrier height to rotation, however, cannot be obtained, nor is it possible to discriminate between the two possible solutions in which the averaging planar forms do or do not reorient in the liquid crystal between successive internal rotations.

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