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Vol. 25 No. 11 (2013): Vol 25 Issue 11

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Synthesis and Phase Transition Behaviours of a Homologous Series of Pyridine Symmetrical Dimers

https://doi.org/10.14233/ajchem.2013.14295
Lay-Khoon Ong
Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jln Genting Klang, Setapak, 53300 Kuala Lumpur, Malaysia
Sie-Tiong Ha
Faculty of Science, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia ; Centre for Biodiversity Research, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia
Guan-Yeow Yeap
Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia

Corresponding Author(s) : Sie-Tiong Ha

hast_utar@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 11 (2013): Vol 25 Issue 11

Abstract

A series of symmetrical dimers bearing heterocyclic ring, a,w-bis-(4-pyridine-4-methylideneaminoxy) alkanes, were prepared and all the members are differed by the alkyl spacer length (CnH2n, where n = 6, 8, 10, 12). Differential scanning calorimetry and polarizing optical microscopy techniques were employed to study their transition temperatures and mesophase characteristics. Differential scanning calorimetry thermograms displayed direct isotropization and recrystallization during heating and cooling processes, respectively. The crystal phase texture changed to dark region (isotropic stage) without exhibiting any mesophase. Influence of molecular structure on the mesomorphic properties of symmetrical dimers was also reported.

Keywords

Dimer Schiff base Pyridine Phase behaviour Synthesis
Ong, L.-K., Ha, S.-T., & Yeap, G.-Y. (2013). Synthesis and Phase Transition Behaviours of a Homologous Series of Pyridine Symmetrical Dimers. Asian Journal of Chemistry, 25(11), 6151–6155. https://doi.org/10.14233/ajchem.2013.14295
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