Conformational Landscapes in the Ground and Excited States Dictate Circularly Polarized Excimer Emission: A Thermodynamic–Kinetic Interplay in Carbazole Dimer Systems
Abstract
We demonstrate that in chiral carbazole dimers, the tt conformer generates intense excimer CPL, while gauche rotamers yield only local emission. In 1a, CPL intensifies and red-shifts upon cooling due to greater tt contribution. In contrast, the tert-butyl derivative 1b shows weak, temperature-insensitive CPL owing to enhanced accessibility of non-CPL-emissive gauche conformers. This work reveals how subtle substituent and environmental effects modulate excited-state conformational dynamics and chiroptical responses through a thermodynamic-kinetic interplay.
Fields of Study & Subjects
Synthesis and Properties of Aromatic Compounds
Photochemistry and Electron Transfer Studies
Luminescence and Fluorescent Materials
Publication details
- Journal / source
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Volume
- 65
- Issue
- 23
- Pages
- e6661486–e6661486
- Publication date
- 26 April 2026
- Language
- EN