標題: Mesogenic Schiff's base ether with dimethylamino end group
作者: Ha, Sie-Tiong
Ong, Lay-Khoon
Wong, Joanna Pik-Wan
Yeap, Guan-Yeow
Lin, Hong-Cheu
Ong, Siew-Teng
Koh, Teck-Ming
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Schiff base;p-n-(dimethylamino)benzylidene-p-alkyloxyanilines;nematic;structure-property relationships
公開日期: 2009
摘要: A series of Schiff base ethers comprising a dimethylamino group at one terminal position and an even number of carbons at the other along the molecular axis was studied. The dimethylamino unit, acting as a charge-transfer donor in the formation of conjugative interactions, contributes to the molecule's polarizability and in turn affecting its intermolecular interactions, leading to the formation of less-ordered mesophase. The mesomorphic properties were studied using polarizing optical microscopy and differential scanning calorimetry. Whilst the n-butyloxy to n-hexadecyloxy derivatives exhibited nematic phase, the n-ethyloxy, n-propyloxy and n-octadecyloxy derivatives were not mesogenic. Their phase transitions during heating and cooling run were presented. The title compounds were compared with other structurally related series to establish their chemical structure-mesomorphic property relationships.
URI: http://hdl.handle.net/11536/7941
http://dx.doi.org/10.1080/01411590902957449
ISSN: 0141-1594
DOI: 10.1080/01411590902957449
期刊: PHASE TRANSITIONS
Volume: 82
Issue: 5
起始頁: 387
結束頁: 397
顯示於類別:期刊論文


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