Pandey Umesh Pratap, Nandi Rajendra Prasad, Thilagar Pakkirisamy
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, India.
Front Chem. 2020 Oct 9;8:541331. doi: 10.3389/fchem.2020.541331. eCollection 2020.
We report a simple and novel molecular design strategy to enhance rISC in boron-based donor-acceptor systems to achieve improved delayed fluorescence characteristics. Dianthrylboryl ((An)B)-based aryl aminoboranes (donor: phenothiazine) and (donor: N,N-diphenylamine) were synthesized by a simple one-pot procedure. The energy of the electronic excited states in and were modulated by varying the arylamine donor strength and electronic coupling between D and A moieties. The presence of a large π-system (anthryl moiety) on boron enhances the electronic communication between donor arylamine and acceptor boryl moieties, and hence, both and exhibit delayed fluorescence characteristics in a broad range of temperatures (80-300 K). Single crystal X-ray analysis and temperature-dependent photophysical studies together with theoretical studies were carried out to rationalize the observed intriguing optical signatures of and .
我们报道了一种简单且新颖的分子设计策略，用于增强基于硼的供体 - 受体体系中的室温磷光，以实现改善的延迟荧光特性。通过简单的一锅法合成了基于二蒽基硼基（(An)B）的芳基氨基硼烷（供体：吩噻嗪）和（供体：N,N - 二苯胺）。通过改变芳胺供体强度以及 D 和 A 部分之间的电子耦合，调节了 和 中电子激发态的能量。硼上大 π 体系（蒽基部分）的存在增强了供体芳胺和受体硼基部分之间的电子通信，因此， 和 在很宽的温度范围（80 - 300 K）内都表现出延迟荧光特性。进行了单晶 X 射线分析、温度依赖的光物理研究以及理论研究，以合理解释观察到的 和 有趣的光学特征。
