Synthesis of Bismaleimides Bearing Electron-Donating Chromophores and Their Fluorescence Behavior during Copolymerization
作者:Xin Zhang、Ying-Hua Jin、Hui-Xiang Diao、Fu-Sheng Du、Zi-Chen Li、Fu-Mian Li
DOI:10.1021/ma0205111
日期:2003.5.1
(symbolized as A(=)−D(*)−A(=)), as well as their saturated model compounds were synthesized, and their steady-state and time-resolved fluorescence spectra were investigated. These A(=)−D(*)−A(=) monomers display strong intramolecular fluorescence quenching. Their fluorescence quantum yields and lifetimes are generally lower than those of their model compounds. It was found that the electron-poor CC bond of maleimide
带有二苯基甲胺,三苯胺或2,5-二苯基-1,3,4-恶二唑发色团(表示为A (=)-D (*) -A (=))的双马来酰亚胺和双钛亚酰亚胺以及它们的饱和模型化合物为合成,并研究了它们的稳态和时间分辨荧光光谱。这些A (=)- D (*) -A (=)单体显示出强烈的分子内荧光猝灭。它们的荧光量子产率和寿命通常低于其模型化合物的荧光量子产率和寿命。发现马来酰亚胺和衣康酰亚胺单元的电子贫C C C键(A (=))起着分子内淬灭,这是相关的A的电子接受能力的关键作用(=) A之间的几何布置和(=)和给电子性发色团(d (*) )。分子内猝灭归因于分子内电荷转移相互作用,这通过分子间荧光猝灭和时间分辨荧光研究得到证实。在分子内猝灭的基础上,可以开发一种新的荧光方法来监测双马来酰亚胺的聚合和固化过程,该过程可以直接反映出碳原子数。聚合和固化过程中的C键消耗量。新的荧光方法不仅可以通过本征荧光技术来利用,而且可以通过外在荧光技术来利用。