Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Electrochromic Properties of Symmetric and Asymmetric Viologens

대칭, 비대칭 Viologen 유도체의 전기변색특성

  • Kim, Sung Hoon (Department of Dyeing and Finishing, Kyungpook National University) ;
  • Bae, Jin Seok (Department of Dyeing and Finishing, Kyungpook National University) ;
  • Hwang, Seok Hwan (Department of Dyeing and Finishing, Kyungpook National University) ;
  • Gwon, Tae Sun (Department of Chemistry, Yeungnam University) ;
  • Do, Myung Ki (Department of Chemistry, Yeungnam University) ;
  • Park, Chul (LG Electronics Research Center)
  • 김성훈 (경북대학교 공과대학 염색공학과) ;
  • 배진석 (경북대학교 공과대학 염색공학과) ;
  • 황석환 (경북대학교 공과대학 염색공학과) ;
  • 권태선 (영남대학교 이과대학 화학과) ;
  • 도명기 (영남대학교 이과대학 화학과) ;
  • 박철 (LG전자기술원)
  • Published : 19961100
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Abstract

Several kind of viologen derivatives were synthesized and the electrochromic property of these compounds was examined by cyclovoltametric and chronoamperometric method, relating to the mechanisum of coloring reaction. The electrochromic properties of 1,1'-diethyl-4,4'-bipyridinium dibromide(EV), 1,1'-dipropyl-4,4'-bipyridinium dibromide(PV), 1,1'-dibuthyl-4,4'-bipyridinium dibromide(BV) and 1-ethyl-1'-butyl-4,4'-bipyridinium dibromide(EBV) are studied by using an propylenecarbonate/methanol solution with $Bu_4NBF_4$ as supporting electrolyte. A monomer-dimer equilibrium was proposed to explain the related observation that EV and EBV cation radical solutions are violet at an applied voltage of 1.7∼3.0V but become blue in open-circuit condition.

Viologen 유도체를 합성하여 이들의 electrochromic(전기변색) 특성을 조사했다. 1, 1'-diethyl-4, 4'-bipiridinium dibromide(EV), 1, 1'-dipropyl-4, 4'-bipyridinium dibromide(PV), 1, 1'-dibuthyl-4, 4'-pyridinium dibromide(BV), 1-ethyl-1'-butyl-4, 4'-bipyridinium dibromide(EBV)를 대상으로 하여 propylene carbonate/methanol 용액내에서 전기변색성을 검토하였다. 또한 전장하에서 EV와 EBV의 cation radical은 dimer를 형성하는 것을 알 수 있었다.

Keywords

References

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