Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Electrochromic Properties of Hexyl- and Perfluorohexyl-Substituted Symmetrical Viologens in Ionic Gels

헥실기와 과불화헥실기가 치환된 대칭형 비올로겐을 포함하는 이온젤의 전기변색 특성에 대한 연구

  • Pande, Gaurav K. (Department of Organic Material Science and Engineering, Pusan National Univeristy) ;
  • Park, Jong S. (Department of Organic Material Science and Engineering, Pusan National Univeristy)
  • 가우랍 판데 (부산대학교 유기소재시스템공학과) ;
  • 박종승 (부산대학교 유기소재시스템공학과)
  • Received : 2020.07.30
  • Accepted : 2020.08.23
  • Published : 2020.08.31
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Abstract

Herein, we present the electrochromic properties of viologen compounds with hexyl and perfluorohexyl substituents in an ionic gel composition. Hexyl viologen (1), and corresponding phenyl-inserted viologen (2) and perfluorohexyl phenyl viologen (3), showed low reduction potentials of -1.4, -1.2, and -1.3 V, respectively. Spectroelectrochemistry measurements of 1 revealed changes from yellow to blue, with a λmax of 596 nm. Further, the phenyl-inserted viologens 2 and 3 showed green transitions, with a λmax of 600 nm, due to longer conjugation by the phenyl moiety. In the cyclic stability measurements, viologen 1 exhibited reversible color changes, with a transmittance change of 35.1% and a corresponding change in optical density of 0.227. Its coloration efficiency was calculated to be 83.6 ㎠/C. Density functional theory calculations showed that both the terminal substitution and phenyl insertion effectively controlled the band-gap energy of the resulting viologen compounds. The findings of this study prove that substituted viologens provide a simple and efficient method to produce wide color ranges using an electrochromic approach. Hence, these compounds will find promising applications in electrochromic displays and windows.

Keywords

Acknowledgement

This work was supported by a 2-Year Research Grant of Pusan National University.

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