Mesogenic Schiff's base ether with dimethylamino end group

Sie Tiong Ha*, Lay Khoon Ong, Joanna Pik Wan Wong, Guan Yeow Yeap, Hong-Cheu Lin, Siew Teng Ong, Teck Ming Koh

*Corresponding author for this work

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)387-397
Number of pages11
JournalPhase Transitions
Issue number5
StatePublished - 1 May 2009


  • Nematic
  • P-n-(dimethylamino)benzylidene-p-alkyloxyanilines
  • Schiff base
  • Structure-property relationships

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    Ha, S. T., Ong, L. K., Wong, J. P. W., Yeap, G. Y., Lin, H-C., Ong, S. T., & Koh, T. M. (2009). Mesogenic Schiff's base ether with dimethylamino end group. Phase Transitions, 82(5), 387-397.