Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers
A lot of studies have been focused on the Schiff base's alkyl and alkyloxy possessing polar terminal group. Yet, the thermotropic properties of Schiff base's ether (alkyloxy) with dialkylamino terminal group remained less studied. A series of 4-(dialkylamino)benzylidene-4'-alkyloxyani...
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Academic Journals
2010
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| Online Access: | http://eprints.utm.my/3391/ https://academicjournals.org/journal/SRE/article-abstract/91BFAA317172 |
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| author | Ha, Sie Tiong Ong, Lay Khoon Yeap, Guan Yeow Ito, Masato Saito, Ayumu Watanabe, Masaaki Lee, Siew Ling |
| author_facet | Ha, Sie Tiong Ong, Lay Khoon Yeap, Guan Yeow Ito, Masato Saito, Ayumu Watanabe, Masaaki Lee, Siew Ling |
| author_sort | Ha, Sie Tiong |
| building | UTM Library |
| collection | Institutional Repository |
| content_provider | Universiti Teknologi Malaysia |
| content_source | UTM Institutional Repository |
| continent | Asia |
| country | Malaysia |
| description | A lot of studies have been focused on the Schiff base's alkyl and alkyloxy possessing polar terminal group. Yet, the thermotropic properties of Schiff base's ether (alkyloxy) with dialkylamino terminal group remained less studied. A series of 4-(dialkylamino)benzylidene-4'-alkyloxyanilines were prepared and all the members are differed by the alkyloxy chain length, CnH2n+1O, where n = 6, 8, 10, 12, 14, 16 and 18. Their transition temperatures and mesophase characteristics were studied by differential scanning calorimetry and optical polarizing microscopy techniques. DSC thermograms exhibited direct isotropization and recrystallization during heating and cooling cycles, respectively. The crystal phase texture changed to dark region isotropic without displaying any mesophase. Lengthening of dialkylamino terminal branch has caused depression of mesomorphic property in the compounds studied. |
| format | Article |
| id | my.utm.eprints-3391 |
| institution | Universiti Teknologi Malaysia |
| publishDate | 2010 |
| publisher | Academic Journals |
| record_format | eprints |
| spelling | my.utm.eprints-33912018-11-29T07:34:28Z http://eprints.utm.my/3391/ Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers Ha, Sie Tiong Ong, Lay Khoon Yeap, Guan Yeow Ito, Masato Saito, Ayumu Watanabe, Masaaki Lee, Siew Ling Q Science (General) A lot of studies have been focused on the Schiff base's alkyl and alkyloxy possessing polar terminal group. Yet, the thermotropic properties of Schiff base's ether (alkyloxy) with dialkylamino terminal group remained less studied. A series of 4-(dialkylamino)benzylidene-4'-alkyloxyanilines were prepared and all the members are differed by the alkyloxy chain length, CnH2n+1O, where n = 6, 8, 10, 12, 14, 16 and 18. Their transition temperatures and mesophase characteristics were studied by differential scanning calorimetry and optical polarizing microscopy techniques. DSC thermograms exhibited direct isotropization and recrystallization during heating and cooling cycles, respectively. The crystal phase texture changed to dark region isotropic without displaying any mesophase. Lengthening of dialkylamino terminal branch has caused depression of mesomorphic property in the compounds studied. Academic Journals 2010-10-04 Article PeerReviewed Ha, Sie Tiong and Ong, Lay Khoon and Yeap, Guan Yeow and Ito, Masato and Saito, Ayumu and Watanabe, Masaaki and Lee, Siew Ling (2010) Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers. Scientific Research and Essays, 5 (19). pp. 3018-3026. ISSN 1992-2248 https://academicjournals.org/journal/SRE/article-abstract/91BFAA317172 |
| spellingShingle | Q Science (General) Ha, Sie Tiong Ong, Lay Khoon Yeap, Guan Yeow Ito, Masato Saito, Ayumu Watanabe, Masaaki Lee, Siew Ling Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title | Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title_full | Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title_fullStr | Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title_full_unstemmed | Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title_short | Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers |
| title_sort | effect of terminal branching on mesomorphism of a homologous series of schiff base ethers |
| topic | Q Science (General) |
| url | http://eprints.utm.my/3391/ https://academicjournals.org/journal/SRE/article-abstract/91BFAA317172 |
| url_provider | http://eprints.utm.my/ |