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Original Articles

The effect of replacing a benzene ring with a saturated six-membered ring on the mesomorphic properties of 4,4′-disubstituted diphenyldiacetylenes

, , , , , , , & show all
Pages 175-184 | Received 24 Jul 2003, Accepted 20 Aug 2003, Published online: 19 May 2010
 

Abstract

A limited selection of ring modified diphenyldiacetylenes of the type where A=, Y=C n H2n+1, CF3, F, COMe, NH2, and NMe2, and A=, trans and cis with Y=F and trans with Y=C3H7, were synthesized. Mesomorphic properties were determined by hot stage polarizing microscopy and DSC. These properties were generally poorer than those found in the parent benzene compounds. This was also true of some pyrimidine analogues reported earlier. Birefringence values also decreased as expected.

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