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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| Format: | Article |
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Academic Journals
2010
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| _version_ | 1825720570663141376 |
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| 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 |
| collection | UM |
| 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. |
| first_indexed | 2024-03-06T05:37:07Z |
| format | Article |
| id | um.eprints-14715 |
| institution | Universiti Malaya |
| last_indexed | 2024-03-06T05:37:07Z |
| publishDate | 2010 |
| publisher | Academic Journals |
| record_format | dspace |
| spelling | um.eprints-147152019-03-20T08:24:28Z http://eprints.um.edu.my/14715/ 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. Academic Journals 2010 Article PeerReviewed Ha, Sie-Tiong and Ong, Lay-Khoon and Sivasothy, Y. and Yeap, Guan-Yeow and Lin, Hong-Cheu and Lee, Siew-Ling and Boey, Peng-Lim and 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, 5 (5). pp. 564-575. ISSN 1992-1950, |
| 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 |
| title | 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_short | 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 |
| topic | Q Science (General) R Medicine |
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