Effects of Lateral Substituents on Mesomorphic Behavior. III. N-4-(4-Alkoxybenzoyloxy)benzylidene]-anilines

The mesomorphic properties of N-4-(4-alkoxybenzoyloxy)benzylidene]-2- and -3-X-anilines, where X = Me, F, Cl, Br or I, were examined. The 2-Me derivatives give higher nematic-isotropic transition temperatures than the 3-Me derivatives, whereas the reverse is true for the F compounds. The intersectio...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1999-01, Vol.326 (1), p.155-164
Main Authors: Matsunaga, Y., Miyake, T., Rikimaru, H., Iwano, N.
Format: Article
Language:English
Subjects:
lateral substituent
Nematic
smectic
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Summary:The mesomorphic properties of N-4-(4-alkoxybenzoyloxy)benzylidene]-2- and -3-X-anilines, where X = Me, F, Cl, Br or I, were examined. The 2-Me derivatives give higher nematic-isotropic transition temperatures than the 3-Me derivatives, whereas the reverse is true for the F compounds. The intersection between the plots of the transition temperatures of the 2-X and 3-X derivatives against the alky chain length is found for the CL, Br, and I compounds, respectively. The smectic A-nematic transition temperature recorded for the heptyloxy member is promoted by the 3-X substitution as much as 32°C (X = F) and 16° (X = Cl).
ISSN:1058-725X
DOI:10.1080/10587259908025412