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Electrochemically fabricated electrochromic films from 4-(N-carbazolyl)triphenylamine and its dimethoxy derivative

机译:4-(N-咔唑基)三苯胺及其二甲氧基衍生物的电化学制备电致变色膜

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摘要

A carbazolyl-substituted triphenylamine derivative, 4-(N-carbazolyl)triphenylamine (TPACz), was synthesized and used to build a fluorescent and electrochromic polymeric film (PTPACz) on the ITO-glass surface by electrochemical oxidative coupling reactions. The electrodeposited PTPACz film showed blue emission (lambda(max) = 424 nm) and exhibited reversible electrochemical redox processes and stable color changes upon electro-oxidation, which can be switched by potential modulation. The remarkable electrochromic behavior of the film is clearly interpreted on the basis of spectroelectrochemical studies. A dimethoxy-substituted derivative of TPACz, namely 4,4'-dimethoxy-4 ''-(N-carbazolyl) triphenylamine (MeOTPACz), was also synthesized and characterized for a comparative study. Repetitive cyclic voltammetry scanning of MeOTPACz in an electrolyte/acetonitrile solution resulted in an electroactive dimeric film of (MeOTPACz)(2) on the electrode surface. Electrochromic devices using PTPACz or (MeOTPACz)(2) as an active layer were also fabricated as preliminary investigations for electrochromic applications.
机译:合成了咔唑基取代的三苯胺衍生物4-(N-咔唑基)三苯胺(TPACz),并用于通过电化学氧化偶联反应在ITO玻璃表面上构建荧光和电致变色聚合物膜(PTPACz)。电沉积的PTPACz膜显示蓝色发射(λ(max)= 424 nm),并显示可逆的电化学氧化还原过程和电氧化后稳定的颜色变化,可以通过电势调制进行切换。在光谱电化学研究的基础上,可以清楚地解释膜的显着电致变色行为。还合成了TPACz的二甲氧基取代的衍生物,即4,4'-二甲氧基-4''-(N-咔唑基)三苯胺(MeOTPACz),并进行了比较研究。在电解质/乙腈溶液中MeOTPACz的重复循环伏安扫描扫描在电极表面产生了(MeOTPACz)(2)的电活性二聚体膜。还制作了使用PTPACz或(MeOTPACz)(2)作为有源层的电致变色器件,作为对电致变色应用的初步研究。

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