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糖太甜521

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The shoulder peak, which is apparently absent in BMBCP, is ascribed to the ICT transition. On one hand, the congested central part where bulky substituents suspend
surround the benzene core leads to largely twisted molecular conformation with shortened conjugation, which might result in a blue-shift tendency; on the other hand, the electron-rich TPA units together with the electron-withdrawing –CN induce the ICT effect in the excited state and give rise to red-shifted emission depending on the solvent polarity. The joint effect between the conjugation and ICT degree definesthe emission of DMCS-TPA.
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糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-13 19:32:31
显然,BMBCP没有肩峰,剑锋是ICT过渡的结果。一方面,在拥挤的中央部分,大体积的取代基暂停包围苯芯很大程度上导致分子构象的扭曲和耦合缩短,这可能会导致蓝移倾向; 另一方面,该富含电子的TPA单位连同吸电子-CN诱导处于兴奋状态的ICT效果,并根据溶剂的极性引起红移发光。耦合和ICT度之间共同作用的程度决定了DMCS-TPA的发光。
2楼2014-10-13 11:30:43
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