心环烯的化学发光和电化学发光增强

时间：2024年12月12日（星期四）上午10:00

地点：化学学科楼A408

报告人简介：

Dr. Zhifeng Ding is a full professor of chemistry at The University of Western Ontario (Western), London city, Ontario province, Canada. He received his B.Sc. degree in chemistry with the highest honor at Southeast University (Nanjing, China), M.Sc. in coordination chemistry under the supervision of Prof. Xiaozeng You at Nanjing University (China) and earned his Ph.D. in physical and analytical electrochemistry in the Girault group at Swiss Federal Institute of Technology in Lausanne (EPFL). After 3 years’ postdoctoral research in Allen J. Bard’s Lab at The University of Texas at Austin, he moved to his present Canadian university, Western, as a faculty member.

His research focuses on scanning electrochemical microscopy, ionic liquids as novel electrolytes, electrochemiluminescence and solar cells. Recently, his group has utilized graphene quantum dots for LED applications. He has published more than 212 papers, more than 3 book chapters, and filed more than 5 US and Chinese patents. Since July 2024, he has been an associate editor for Canadian Journal of Chemistry. Dr. Ding has received several awards including most recently: Western Science Distinguished Research Professor 2014-2015; Western University Faculty Scholar 2015-2016; 2017 Canadian Society for Chemistry W.A.E. McBryde Medal for his significant achievement in analytical chemistry; 2017 and 2018 Western Vanguard Awards for filing patents in solar energy; 2018 Ertl award (International) for electrochemistry and electrocatalysis for his contributions to solar cell research; honorable speaker for the Bernard L. Feringna (2016 Nobel Laureate) Advance Chemistry Lecture Series at East China of Science and Technology (2018); 2023 Chemistry Research Award of Excellence at Western.

报告摘要：

Herein, we report the design and synthesis of azaborahelicene corannulene 1 through hybridization of an azabor helical structure and subsequent luminescence studies. Significant enhancement in chemiluminescence (CL) electrochemiluminescence (ECL) and photoluminescence (PL) is achieved compared to the pristine corannulene: 25-fold for CL, up to 23-fold for ECL with BPO as a coreactant, and 30-fold for PL, respectively. Intriguingly, the blue light emission observed in all three luminescence types suggests the presence of a single excited state. As revealed by variable-temperature (VT) 1H NMR experiments, the bowl inversion frequency apparently decelerates by steric effect of the helix motif in 1, which could contribute to the enhanced luminescent properties by reducing excited energy losses non-radiatively through fewer molecular motions; these enhanced luminescence observations could be categorized alongside of the aggregation induced emission (AIE) and crystallization-induced emission (CIE) phenomena.