Effects of electron-accepting substituents on the fluorescence of oxygen-bridged triarylamine
Effects of electron-accepting substituents on the fluorescence of oxygen-bridged triarylamine
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DOI：
10.1016/j.dyepig.2023.111281
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发表时间：
2023-04
影响因子：
4.5
通讯作者：
Ruito Hashimoto;Tomoya Nakamura;Minh Anh Truong;R. Murdey;A. Wakamiya
中科院分区：
文献类型：
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作者：
Ruito Hashimoto;Tomoya Nakamura;Minh Anh Truong;R. Murdey;A. Wakamiya
合成了带有硝基和二甲基硼基取代基的新的电子接受氧桥三苯胺。利用光学和电化学表征，阐明了吸电子取代基对准平面三芳胺骨架的影响。与未桥联硝基取代三苯胺参比物相比，氧桥联结构具有更小的光学间隙，将吸收和荧光波长转移到更长的波长。电子激发态的结构弛豫受到抑制，斯托克斯位移减小。由于振动耦合的抑制，用二三苯基硼基取代硝基取代基导致荧光量子产率增加。
New electron-accepting oxygen-bridged triphenylamines were synthesized with nitro and dimesitylboryl substituents. Using optical and electrochemical characterization, the effect of electron-withdrawing substituents on quasi-planar triarylamine skeletons was clarified. Compared with the unbridged nitro-substituted triphenylamine reference, the oxygen-bridged structure featured a smaller optical gap, shifting the absorption and fluorescence wavelengths to longer wavelengths. Structural relaxation in the electronically excited state was suppressed, and the Stokes shift was reduced. Replacing the nitro substituent with a dimesitylboryl group resulted in an increase in the fluorescence quantum yield due to the suppression of the vibronic coupling.