A homologous series of di(4-alkyloxybenzoates) of 4,4′-dimercaptobiphenyl: CH3(CH2)n-1O‒C6H4‒COS‒C6H4‒C6H4‒SOC‒C6H4‒O(CH2)n-1CH3, n=1–7, has been synthesized and the thermotropic liquid-crystalline behaviour investigated. All compounds exhibit enantiotropic mesomorphism over a remarkable temperature range. While the mesophase thermal stability is moderately higher than that found for the corresponding oxygenated analogues, the smectic stability is definitely lower. In fact, all the compounds are nematic but smectic mesomorphism (SC) is observed for n = 7. Compounds with n = 6 or 7 exhibit enantiotropic highly ordered smectic (or disordered crystal) phases, probably SG in type. © 1992 Taylor & Francis Group, LLC.
Berti C., Marianucci E., Pilati F., Toselli M., Roviello A., Sirigu A. (1992). Sulphur containing mesogens. the mesophasic behaviour of di(4-alkyloxybenzoates) of 4, 4′-dimercaptobiphenyl. LIQUID CRYSTALS, 12(5), 821-829 [10.1080/02678299208029125].
Sulphur containing mesogens. the mesophasic behaviour of di(4-alkyloxybenzoates) of 4, 4′-dimercaptobiphenyl
Berti C.;Marianucci E.;Pilati F.;Toselli M.;
1992
Abstract
A homologous series of di(4-alkyloxybenzoates) of 4,4′-dimercaptobiphenyl: CH3(CH2)n-1O‒C6H4‒COS‒C6H4‒C6H4‒SOC‒C6H4‒O(CH2)n-1CH3, n=1–7, has been synthesized and the thermotropic liquid-crystalline behaviour investigated. All compounds exhibit enantiotropic mesomorphism over a remarkable temperature range. While the mesophase thermal stability is moderately higher than that found for the corresponding oxygenated analogues, the smectic stability is definitely lower. In fact, all the compounds are nematic but smectic mesomorphism (SC) is observed for n = 7. Compounds with n = 6 or 7 exhibit enantiotropic highly ordered smectic (or disordered crystal) phases, probably SG in type. © 1992 Taylor & Francis Group, LLC.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
