Chemical Research in Chinese Universities ›› 1991, Vol. 7 ›› Issue (1): 42-46.

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Fourier Transform Infrared Study on the Melting Phase Transition of Octadecanoic Acid

Jiang Yutao, Tian Yongchi Liang Yingqiu   

  1. Institute of Theoretical Chemistry, Jilin University, Changchun
  • Received:1989-12-05 Online:1991-01-24 Published:2011-09-09
  • Supported by:

    Suported by the National Natural Science Foundation of China

Abstract: Fourier transform Infrared (FT-IR) spectroscopy was used to study the melting phase transition of anhydrous octadecanoic acid. The phase transition occurs at 69℃(Tc). In solid phase, the alkyl chains take the all-trans zigzag conformation and the CB-Ca= 0 group adopts trans configuration in the dimers. In liquid state, the alkyl chains convert to gauche conformation and the CB-Ca= 0 to cis configuration.

Key words: FT-IR, Phase transition, Octadecanoic acid