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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 40, Number 11
JKCSEZ 40(11)
October 20, 1996 

 
Title
Electrochromic Properties of Symmetric and Asymmetric Viologens

대칭, 비대칭 Viologen 유도체의 전기변색 특성
Author
Sung Hoon Kim, Jin Seok Bae, Seok Hwan Hwang, Tae Sun Gwon, Myung Ki Doh, Chul Park

김성훈, 배진석, 황석환, 권태선,도명기,박철
Keywords
Abstract
Viologen 유도체를 합성하여 이들의 electrochromic(전기변색)특성을 조사했다. 1,1'-diethyl-4,4'-bipyridinium dibromide(EV), 1,1'-dipropyl-4,4'-bipyridinium dibromide(PV), 1,1'-dibuthyl-4,4'-bipyridinium 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 알수 있었다.

Several kind of viologen derivatives were synthesized and the electrochromic property of these compounds was examined by cyclovoltametric and chronoamperometric method, relating to the mechanism 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 Bu4NBF4 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.

Page
686 - 691
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