摘要
用ESR研究了菲醌(PQ)、四氟对寒醌(TClQ)、2,3-二氯-5,6-二氰苯醌(DDQ)和苯醌(BQ)与三乙胺、(Et_3bN)的电子转移反应过程。实验结果表明,醌上取代基吸电子能力越强,越易与Et_3N反应,但所形成半醌负离子自由基的稳定性,则并未有此规律,而是由自由基终止机理所决定。由实验得到了DDQ与Et_3N的表变曲线。本文讨论了DDQ与Et_3N反应的机理,并得其反应的微分方程,用实验拟合曲线确定速率常数。然后,对该方程求解,与实验曲线比较初步确定了该反应的历程。
The electron transfer from triethylamine (Et3N) to phenanthraquinone (PQ),chloranil (TC1Q),2,3-dicyano-5,6-dichloro-l,4-benzoquinone (DDQ) and benzoquinone (BQ) was studied by ESR spectroscopy.The results indicated that the stronger the electron withdrawing capacity of quinones is,the easier they react with Et籒.But the stability of semiquinone radicals is affected by the properties of the substituted groups of quinones and the mechanism of radicals termination.From the DDQ- decay curves by the experiment,we proposed a reaction mechanism was proposed for DDQ and Et3N.Comparing the solutions of the equation and the experimental data,the reaction mechanism was confirmed.
出处
《感光科学与光化学》
CSCD
1990年第2期126-133,共8页
Photographic Science and Photochemistry
关键词
醌类化合物
三乙胺
电子转移
醌
quinones,triethylamine,electron transfer,semiquinone radicals
