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Tetraphenylethylenepyrrolo[3,2-b]pyrrole Hybrids as Solid-State Emitters: The Role of Substitution Pattern
Organic Letters ( IF 4.9 ) Pub Date : 2018-05-23 00:00:00 , DOI: 10.1021/acs.orglett.8b01011
Bartłomiej Sadowski 1 , Khaled Hassanein 2 , Barbara Ventura 2 , Daniel T. Gryko 1
Affiliation  

Two hybrid dyes possessing tetraphenylethylene moieties weakly conjugated with a pyrrolo[3,2-b]pyrrole core have been synthesized. Both dyes display a weak emission in solution, however, in the solid state a ∼100-fold increase in the fluorescence quantum yield is observed. The position of the molecular rotors about the core greatly influences the photophysical characteristics. The variances in emission properties were assigned to entirely different changes in dihedral angles upon excitation, which in turn have substantial effects on radiative rate constants, allowed transitions, and HOMO/LUMO distribution.

中文翻译:

四苯基乙烯吡咯并[3,2- b ]吡咯杂化物作为固态发射体:取代模式的作用。

合成了两种杂化染料,它们具有与吡咯并[3,2- b ]吡咯核弱共轭的四苯基乙烯部分。两种染料在溶液中均显示出微弱的发射,但是,在固态下,观察到荧光量子产率提高了约100倍。分子转子围绕核的位置极大地影响了光物理特性。发射特性的变化被赋予激发时二面角的完全不同的变化,这反过来对辐射速率常数,允许的跃迁和HOMO / LUMO分布产生实质性影响。
更新日期:2018-05-23
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