||Kai-shiang Ye |
|Author's Email Address
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|Type of Document
||Factors Controlling the Supramolecular Assembly of Benzene-1,3,5-Tricarboxamide LC|
|Date of Defense
||intermolecular hydrogen bonding
||In this report, we synthesized a series of benzene-1, 3, 5-tricarboxamide derivatives with various peripheral side chain length and investigated their mesogenic properties by POM, DSC, and XRD. The liquid crystalline compounds mesophase was characterized as Colh. |
The XRD data reveal different packing of the molecules in relation to the peripheral alkoxy chain length. The nature of the side chains in benzene-1, 3, 5-tricarboxamide has been reported to give different crystal packing, whereby either one of the following forces predominant: (i) pi-pi interactions of carbonyl with aryl without intermolecular order (coplanar) or (ii) 3-fold intermolecular hydrogen bonding whereby the amide has to make a torsion angle with the aryl mean plane.
Furthermore, we envisaged for the first time the alkylation of the amide nitrogen with the hope of reducing the void in the packing, and tuning the mesogenic properties. The steric effect was found to be important, making the short alkoxy peripheral chain not liquid crystalline. We also mixed the alkylated amide with the no-alkylated amide compound with the hope of good CPI interaction r and the formation of a new supramolecular assembly.
||Kwang-Ming Lee - chair|
Tsu-hsin Chang - co-chair
Hsiu-Hui Chen - co-chair
Chi-Wi Ong - advisor
Indicate in-campus at 5 year and off-campus access at 5 year.|
|Date of Submission