影像科学与光化学 ›› 1992, Vol. 10 ›› Issue (2): 123-130.DOI: 10.7517/j.issn.1674-0475.1992.02.123

• 研究论文 • 上一篇    下一篇

N,N,N′,N′-对四甲基苯二胺光致电子转移变色体系的研究

贺军辉, 孙军, 王尔鉴   

  1. 中国科学院感光化学研究所, 北京 100101
  • 收稿日期:1990-10-12 修回日期:1991-04-04 出版日期:1992-05-20 发布日期:1992-05-20
  • 通讯作者: 王尔鉴

PHOTOCHROMISM SYSTEM OF N,N,N,’N’-TETRAMETHYL-P-PHENYLENEDIAMINE VIA ELECTRON TRANSFER

HE JUN-HUI, SUN JUN, WANG ER-JIAN   

  1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, P.R. China
  • Received:1990-10-12 Revised:1991-04-04 Online:1992-05-20 Published:1992-05-20

摘要: 研究了由N,N,N′,N′-对四甲基苯二胺(TMPD)/电子受体组成的光致电子转移变色体系,及其在溶液中和高分子膜中的光反应和热稳定性。实验结果表明这类光致变色体系具有较高速度的光响应能力。在不同芳胺/碘鎓盐(DPIOC)组成的体系中,可观察到电子转移速度随芳胺的氧化还原电位下降而增加:TMPD>N,N-二甲基苯胺>三苯胺>二苯胺。光反应速度和反应物浓度具有一定指数关系,分别为0.66(TMPD)和0.16(二苯基碘铕盐)。在TMPD/卤代烃(RX)组成的体系中,发现卤代烃的C—X键较弱时,体系的光致生色反应速度较快。显然,这是由于反应中间产物(RX-)的分解有利于减少电子逆转移反应的缘故。在聚甲基丙烯酸甲酯高分子膜中的光致生色反应效率显著地高于溶液中的反应效率,并能获得较高的光密度。热稳定性结果表明,温度对色稳定性有显著影响,每经过一次生色/褪色循环,体系的发色能力下降一半左右。

关键词: N,N′,N′-对四甲基苯二胺/受体, 光致变色, 电子转移

Abstract: Photoreaction and thermal stability of the electron transfer photochromism system composed of N,N,N’,N’-tetramethyl-p-phenylenediamine (TMPD)/electron acceptor were studied in solutions and polymer films. Experimental results showed that this kind of photochromism system has high sensitivity of photoresponse. In the arylamine/onium salt (DPIOC) systems, it could be observed that rate of electron transfer increases with the decrease of oxidation potential of the arylamines, i.e., TMPD>DMA>TPA>DPA. The relationships between photoreac-tion rates and concentrations of reactants were obtained with exponents 0.66 (TMPD) and 0.16 (DPIOC) respectively. In TMPD/halogenated alkane systems, it could be found that halogena-ted alkanes having weaker C-X bonds exhibit higher rates of photochromism reaction, due to the decrease of back electron transfer reactions resulted from further decomposition of the reaction intermediate (RX-). Efficiencies of photoinduced coloration in PMMA films are much higher than those in solutions. The thermal stability data indicated that the color stability is dependent significantly on the temperature, and coloration ability of the system reduces about a half via a circle of alternate photocoloration and thermal decoloration.

Key words: N,N’,N’-tetramethyl-p-phenylenediamine/acceptor, Photochromism, electron transfer