Aza[7]helicene Diimide: Backbone-Controlled Excited-State Charge Transfer and Electronic Coupling
Abstract
A carbazole-embedded aza[7]helicene diimide (aza[7]HDI) was synthesized as a backbone-engineered [7]HDI. Unlike outer-rim donor-substituted push-pull [7]HDIs, aza[7]HDI combines pronounced excited-state charge transfer character with strengthened interimide electronic communication. It exhibits strong solvatochromic fluorescence and circularly polarized luminescence, a large excited-state dipole-moment change, and enhanced fluorescence quantum yields. Electrochemical and quantum-chemical analyses consistently support enhanced through-space coupling. Backbone donor incorporation thus emerges as an effective strategy for tuning excited-state polarization and electronic coupling in chiral donor-acceptor helicenes.
Fields of Study & Subjects
Synthesis and Properties of Aromatic Compounds
Photochromic and Fluorescence Chemistry
Photochemistry and Electron Transfer Studies
Publication details
- Journal / source
- Organic Letters
- Publisher
- American Chemical Society (ACS)
- Volume
- 28
- Issue
- 21
- Pages
- 6741–6746
- Publication date
- 20 May 2026
- Language
- EN