Research Article Open Access

New Schiff Bases with Pyridine Core: Spectral, Thermal and Optical Characterizations

Sie-Tiong Ha1, Lay-Khoon Ong1, Yip-Foo Win1, Guan-Yeow Yeap1, Nilesh L. Bonde1 and Peng-Lim Boey1
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American Journal of Applied Sciences
Volume 7 No. 5, 2010, 656-660

DOI: https://doi.org/10.3844/ajassp.2010.656.660

Submitted On: 12 March 2010 Published On: 31 May 2010

How to Cite: Ha, S., Ong, L., Win, Y., Yeap, G., Bonde, N. L. & Boey, P. (2010). New Schiff Bases with Pyridine Core: Spectral, Thermal and Optical Characterizations. American Journal of Applied Sciences, 7(5), 656-660. https://doi.org/10.3844/ajassp.2010.656.660

Abstract

Problem statement: Numerous studies have been conducted on the Schiff base's alkyl and alkyloxy possessing aromatic core. However, the thermo tropic properties of Schiff base's ester (or alkanoyloxy) with pyridine core was rare studied. Approach: To study spectral, thermal and optical behaviors of Schiff base ester possessing heterocyclic (pyridine) terminal core. A series of 4-[(pyridin-3-ylmethylene) amino] phenylalkanoates were prepared and all the members are differed by the length of alkanoyloxy chain, Cn-1H2n-1COO, where n = 12, 14, 16 and 18. The thermal and optical characteristics were studied using differential scanning calorimetry and polarizing optical microscopy. Results: DSC studies showed that all of the title compounds exhibited direct isotropization and recrystallization during heating and cooling cycles, respectively. Under polarizing optical microscope, crystal phase texture was observed to change to dark region isotropic without displaying any liquid crystal phase. Conclusion: The presence of terminal pyridine core suppressed the formation of mesosphere in the compounds studied.

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Keywords

  • Pyridine
  • azomethine
  • thermo tropic
  • phase transition