Fluorescence Modulation through the Inverted Energy Gap Law in Triply N−B←N‐Containing Windmill‐Shaped Triazines
Year: 2024
Type: article
Abstract: A series of windmill‐shape heterocyclic molecules containing three N−B←N units, TBN and its derivatives, with quasi‐planar C 3 symmetric backbone, are synthesized. The parent TBN exhibits a strongly allowed, doubly degenerate lowest excited state but suffers from very low fluorescence, due to very fast nonradiative decay rate through a conical intersection (CI) as revealed by femtosecond transient absorption spectroscopy and quantum‐chemical calculations. Introducing peripheral phenyl‐ or thienyl‐groups (Ph‐TBN or Th‐TBN) induces pronounced bathochromic shifts and enhances fluorescence, which is beneficial from inhibited nonradiative pathway by the increased energy barriers to access the CI at excited state. The understanding of this rather uncommon behaviour may open routes for the design of novel fluorescence materials.
Source: Angewandte Chemie
Authors: Yi Feng, Liangxuan Wang, Hongcheng Gao, Jiadong Zhou, Matthias Stolte, Honglin Qiu, Linlin Liu, Victor Adebayo, Martial Boggio‐Pasqua, Frank Würthner, Johannes Gierschner, Zengqi Xie
Institutions: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Madrid Institute for Advanced Studies, IMDEA Nanoscience, University of Tübingen, University of Würzburg, Centre National de la Recherche Scientifique, Université Toulouse III - Paul Sabatier, Laboratoire de Chimie et Physique Quantiques
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4403942836