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Enhancing Intersystem Crossing to Achieve Thermally Activated Delayed Fluorescence in a Water-Soluble Fluorescein Derivative with a Flexible Propenyl Group.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-06-22 , DOI: 10.1021/acs.jpclett.0c01297 Yingnan Wu 1 , Yanliang Zhao 1 , Panwang Zhou 1 , Daoyuan Zheng 1 , Honglei Wang 1 , Shanliang Tang 2 , Jiarui Tian 1 , Songqiu Yang 3 , Weiqiao Deng 1 , Keli Han 1, 3 , Fengling Song 1, 2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-06-22 , DOI: 10.1021/acs.jpclett.0c01297 Yingnan Wu 1 , Yanliang Zhao 1 , Panwang Zhou 1 , Daoyuan Zheng 1 , Honglei Wang 1 , Shanliang Tang 2 , Jiarui Tian 1 , Songqiu Yang 3 , Weiqiao Deng 1 , Keli Han 1, 3 , Fengling Song 1, 2
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It is a challenge to rationally design an organic molecule with thermally activated delayed fluorescence (TADF) due to the intrinsically spin-forbidden transition. Meanwhile, those reported TADF organic molecules have difficulty to be directly applied in the field of biological and medical imaging because they usually have no water solubility. Here, a water-soluble TADF organic molecule DCF-BXJ was developed by introducing a flexible propenyl group into the commercial traditional fluorophore DCF (2,7-dichlorofluorescein). The flexible group provides nonradiative rotational motion, which causes an efficient energy level cross between the S1 state and the T2 state of DCF-BXJ. Results of transient absorption spectra and theoretical calculations supported that nonradiative rotational motion of the flexible group can enhance intersystem crossing (ISC) and bring out TADF. This work provides a new mechanism explanation for TADF existing in organic molecules.
中文翻译：
在具有柔性丙烯基的水溶性荧光素衍生物中，增强系统间交叉以实现热激活延迟荧光。
由于固有的自旋禁止跃迁，合理设计具有热激活延迟荧光（TADF）的有机分子是一个挑战。同时，那些报道的TADF有机分子由于通常不溶于水而难以直接应用于生物学和医学成像领域。在此，通过将柔性丙烯基引入商业化的传统荧光团DCF（2,7-二氯荧光素）中来开发水溶性TADF有机分子DCF-BXJ。柔性组提供非辐射旋转运动，这导致S 1状态和T 2之间的有效能级交叉DCF-BXJ的状态。瞬态吸收光谱和理论计算的结果支持柔性组的非辐射旋转运动可以增强系统间交叉（ISC）并带出TADF。这项工作为有机分子中存在的TADF提供了新的机理解释。
更新日期：2020-07-16
中文翻译：
在具有柔性丙烯基的水溶性荧光素衍生物中，增强系统间交叉以实现热激活延迟荧光。
由于固有的自旋禁止跃迁，合理设计具有热激活延迟荧光（TADF）的有机分子是一个挑战。同时，那些报道的TADF有机分子由于通常不溶于水而难以直接应用于生物学和医学成像领域。在此，通过将柔性丙烯基引入商业化的传统荧光团DCF（2,7-二氯荧光素）中来开发水溶性TADF有机分子DCF-BXJ。柔性组提供非辐射旋转运动，这导致S 1状态和T 2之间的有效能级交叉DCF-BXJ的状态。瞬态吸收光谱和理论计算的结果支持柔性组的非辐射旋转运动可以增强系统间交叉（ISC）并带出TADF。这项工作为有机分子中存在的TADF提供了新的机理解释。
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