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April 28, 2026Angewandte Chemie0 citationsOpen Access

Conformational Landscapes in the Ground and Excited States Dictate Circularly Polarized Excimer Emission: A Thermodynamic–Kinetic Interplay in Carbazole Dimer Systems

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TKTomohiro KujimeZWZhe WangTMTadashi Mori

Key Points

  • This research investigates how conformational landscapes in chiral carbazole dimers influence excimer emission and chiroptical responses.
  • Examined chiral carbazole dimers with different substituents and conformers.
  • Analyzed the effect of temperature on circularly polarized luminescence (CPL) intensity and wavelength.
  • Conducted comparisons between the intense excimer emission of tt conformers and the weaker emission of gauche conformers.
  • The tt conformer of carbazole dimers produced significant excimer CPL, while gauche rotamers emitted locally.
  • Cooling enhanced CPL intensity and shifted it red for tt conformers due to their increased presence.
  • The tert-butyl derivative exhibited weak, temperature-insensitive CPL from its less emissive gauche conformers.

Abstract

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.

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Cite This Study

Kujime et al. (2026) studied this question.

synapsesocial.com/papers/69f04e7d727298f751e726c9https://doi.org/10.1002/ange.6661486
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