SYNTHESIS AND MESOMORPHIC PROPERTIES OF THE HOMOLOGOUS SERIES OF 4-ALKYL OR ALKOXY-4 prime -BROMO OR CYANOTOLANES.

Article abstract of DOI:10.1080/15421408008084015

A homologous series of 4-alkyl or alkoxy-4 prime -bromo or cyanotolanes in which the alkyl group is C//4 yields C//1//0 and the alkoxy group is C//1 yields C//1//2, was prepared. Interphase transitions between solid, mesomorphic and isotropic phases were studied by hot stage microscopy and differential scanning calorimeter. The bromo compounds have a smectic polymorphism. Three pure products of cyano derivatives with the chains C//9H//1//9O, C//1//0H//2//1O amd C//1//0H//2//1 present an enantiotropic or monotropic reentrant nematic phase at atmospheric pressure. The reentrant phenomenon itself is discussed as well as the absence of correlation between T//N//A/T//N//I McMillan parameter and the heat of transition. A plot of the nematic isotropic transition temperatures against the number of carbon atoms in the alkoxy chain shows the usual odd even effect.

Full text of DOI:10.1080/15421408008084015

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Molecular Crystals and Liquid
Crystals
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Synthesis and Mesomorphic
Properties of the Homologous
Series of 4-Alkyl or Alkoxy-4′-
Bromo or Cyanotolanes
Nguyen Huu Tinh a , A. Pourrere a & C. Destrade a
a Centre de Recherche Paul Pascal , Domaine
Universitaire , 33405, Talence, Cedex, France
Published online: 21 Mar 2007.
To cite this article: Nguyen Huu Tinh , A. Pourrere & C. Destrade (1980) Synthesis
and Mesomorphic Properties of the Homologous Series of 4-Alkyl or Alkoxy-4′-Bromo
or Cyanotolanes, Molecular Crystals and Liquid Crystals, 62:1-2, 125-139, DOI:
10.1080/15421408008084015
To link to this article: http://dx.doi.org/10.1080/15421408008084015
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