Mesomorphic Properties of Di- (4 - Alkoxyphenyl) and Di- (4 - Alkanoyloxyphenyl) Tetrathiafulvalenes |
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| Authors: | A Babeau Nguyen Huu Tinh H Gasparoux C Polycarpe E Torreilles L Giral |
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| Institution: | 1. Centre de Recherche Paul Pascal, Domaine Universitaire , 33405, TALENCE, Cédex, FRANCE;2. Laboratoire de Chimie organique structurale U.S.T.L. , 34060, MONTPELLIER, Cédex, FRANCE |
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| Abstract: | The polymorphism of the di- (4 - alkoxyphenyl) and di- (4 - alkanoyloxyphenyl) tetrathiafulvalenes (TTF) is investigated. In the dialkoxy series, the short chain derivative exhibits a smectic G phase and a nematic phase. The latter phase disappears in the long chain derivative. The dialkanoyloxy derivatives exhibit a smectic G phase (for short chains) and a smectic C phase (for long chains). A plot of the mesormorphic-isotropic transition temperatures against the number of carbon atoms of the substituent shows the usual odd-even effect. Some tetra (alkoxyphenyl) tetrathiafulvalenes are described, unfortunately they have no mesomorphic properties. |
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