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Related Experiment Video

Updated: Jan 19, 2026

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Multiple Anti-Kasha Emissions in Transition-Metal Complexes.

Milena Röhrs1, Daniel Escudero1

  • 1Department of Chemistry, Quantum Chemistry and Physical Chemistry Division , KU Leuven , Celestijnenlaan 200F , B-3001 Heverlee , Belgium.

The Journal of Physical Chemistry Letters
|September 13, 2019
PubMed
Summary

This study reveals that higher-lying excited states, not just the lowest, drive light emission in [M(CO)4(bpy)] complexes, challenging Kasha's rule. This finding is crucial for understanding transition-metal complex photophysics.

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Area of Science:

  • Photochemistry
  • Inorganic Chemistry
  • Quantum Chemistry

Background:

  • Kasha's rule predicts light emission from the lowest excited state.
  • Transition-metal complexes often exhibit complex photophysical behavior.

Purpose of the Study:

  • To investigate the excited-state dynamics and emission pathways of [M(CO)4(bpy)] complexes (M = Cr, Mo, W).
  • To provide first-principles evidence for the violation of Kasha's rule in these systems.

Main Methods:

  • First-principles calculations were employed to model the electronic structure and excited states.
  • Analysis of emission spectra and excited-state deactivation dynamics.

Main Results:

  • Several higher-lying excited states were identified as responsible for the emission spectrum of [M(CO)4(bpy)] complexes.
  • Violation of Kasha's rule was observed, with multiple excited states contributing to emission in [W(CO)4(bpy)] and [Mo(CO)4(bpy)].
  • These are the first transition-metal complexes demonstrated to exhibit simultaneous equilibrated and nonequilibrated anti-Kasha emissions.

Conclusions:

  • The emissive processes in tetracarbonyl-diimine transition-metal complexes are complex.
  • Excited-state deactivation dynamics are governed by a balance of electronic and geometrical factors.
  • This work challenges fundamental photophysical principles and opens new avenues for designing luminescent materials.