$Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies$

Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies

A new homologous series of Schiff base esters comprising a terminal chloro substituent was studied. The chloro substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in smectic polymorphism. The mesomorphic properties were studied using...

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Main Authors:	Ha, Sie-Tiong, Ong, Lay-Khoon, Sivasothy, Y., Yeap, Guan-Yeow, Lin, Hong-Cheu, Lee, Siew-Ling, Boey, Peng-Lim, Bonde, N.L.
Format:	Article
Published:	2010
Subjects:	Q Science (General) R Medicine
Online Access:	http://eprints.um.edu.my/14715/

id	um-14715
recordtype	eprints
spelling	um-147152015-11-11T02:10:47Z Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies Ha, Sie-Tiong Ong, Lay-Khoon Sivasothy, Y. Yeap, Guan-Yeow Lin, Hong-Cheu Lee, Siew-Ling Boey, Peng-Lim Bonde, N.L. Q Science (General) R Medicine A new homologous series of Schiff base esters comprising a terminal chloro substituent was studied. The chloro substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in smectic polymorphism. The mesomorphic properties were studied using differential scanning calorimetry, polarizing optical microscopy and temperature-dependent X-ray diffractometry. Whilst the n-pentanoyloxy and n-heptanoyloxy derivatives exhibited enantiotropic smectogenic A and B phases, monotropic smectogenic A and B phases were observed in the n-butanoyloxy and n-hexanoyloxy derivatives. Enantiotropic smectogenic A and monotropic smectogenic B phases were observed in the n-octanoyloxy to n-hexadecanoyloxy derivatives. The highest member of this series, the n-octadecanoyloxy derivative, exhibited an enantiotropic smectogen A phase. The homologous members were compared with structurally related series to establish their chemical structure-mesomorphic behavior relationships. 2010 Article PeerReviewed Ha, Sie-Tiong; Ong, Lay-Khoon; Sivasothy, Y.; Yeap, Guan-Yeow; Lin, Hong-Cheu; Lee, Siew-Ling; Boey, Peng-Lim; Bonde, N.L. (2010) Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies. International Journal of the Physical Sciences <http://eprints.um.edu.my/view/publication/International_Journal_of_the_Physical_Sciences.html>, 5 (5). pp. 564-575. http://eprints.um.edu.my/14715/
repository_type	Digital Repository
institution_category	Local University
institution	University Malaya
building	UM Research Repository
collection	Online Access
topic	Q Science (General) R Medicine
spellingShingle	Q Science (General) R Medicine Ha, Sie-Tiong Ong, Lay-Khoon Sivasothy, Y. Yeap, Guan-Yeow Lin, Hong-Cheu Lee, Siew-Ling Boey, Peng-Lim Bonde, N.L. Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
description	A new homologous series of Schiff base esters comprising a terminal chloro substituent was studied. The chloro substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in smectic polymorphism. The mesomorphic properties were studied using differential scanning calorimetry, polarizing optical microscopy and temperature-dependent X-ray diffractometry. Whilst the n-pentanoyloxy and n-heptanoyloxy derivatives exhibited enantiotropic smectogenic A and B phases, monotropic smectogenic A and B phases were observed in the n-butanoyloxy and n-hexanoyloxy derivatives. Enantiotropic smectogenic A and monotropic smectogenic B phases were observed in the n-octanoyloxy to n-hexadecanoyloxy derivatives. The highest member of this series, the n-octadecanoyloxy derivative, exhibited an enantiotropic smectogen A phase. The homologous members were compared with structurally related series to establish their chemical structure-mesomorphic behavior relationships.
format	Article
author	Ha, Sie-Tiong Ong, Lay-Khoon Sivasothy, Y. Yeap, Guan-Yeow Lin, Hong-Cheu Lee, Siew-Ling Boey, Peng-Lim Bonde, N.L.
author_facet	Ha, Sie-Tiong Ong, Lay-Khoon Sivasothy, Y. Yeap, Guan-Yeow Lin, Hong-Cheu Lee, Siew-Ling Boey, Peng-Lim Bonde, N.L.
author_sort	Ha, Sie-Tiong
title	Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
title_short	Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
title_full	Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
title_fullStr	Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
title_full_unstemmed	Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies
title_sort	mesogenic schiff base esters with terminal chloro group: synthesis, thermotropic properties and x-ray diffraction studies
publishDate	2010
url	http://eprints.um.edu.my/14715/
first_indexed	2018-09-06T06:25:06Z
last_indexed	2018-09-06T06:25:06Z
_version_	1610838291154731008

Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies

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