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Dynamic Excited-State Localization Induced by Jahn-Teller Distortion Observed by Coherent Vibrational Spectroscopy.

Takumi Ehara1, Yusuke Yoneda2,3, Tatsuya Yoshida1

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Dynamic symmetry breaking in aluminum complexes enhances optoelectronic properties. Excited-state distortions, coupled with vibrations, lead to large Stokes shifts and high photoluminescence quantum yields in functional materials.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Main-group Chemistry

Background:

  • Molecular symmetry is key in functional materials, but its excited-state dynamics and impact on optoelectronics are understudied, especially in main-group p-block elements.
  • Aluminum (Al) dinuclear triple-helical complexes with twisted π-conjugated systems offer potential for unique optoelectronic properties.

Purpose of the Study:

  • To investigate the dynamic modulation of molecular symmetry in the excited state of Al(III) dinuclear triple-helical complexes.
  • To elucidate the relationship between excited-state symmetry breaking, vibrational dynamics, and optoelectronic properties like large Stokes shifts and high photoluminescence quantum yields.

Main Methods:

  • Femtosecond (10 fs) transient absorption spectroscopy to probe excited-state dynamics.
  • Analysis of coherent vibrational oscillations and their dephasing times to identify symmetry-breaking events.
  • Computational analysis to correlate observed phenomena with specific vibrational modes (intraligand twisting).

Main Results:

  • Detection of coherent vibrational oscillations in the excited state of Al(III) complexes.
  • Identification of photoexcitation-triggered Jahn-Teller distortions via short dephasing times (410 fs) linked to intraligand twisting vibrations.
  • Demonstration of exceptionally large Stokes shifts and high photoluminescence quantum yields in these high-symmetry complexes.

Conclusions:

  • Excited-state symmetry breaking, strongly coupled with intraligand twisting vibrations, is critical for achieving large Stokes shifts and high photoluminescence quantum yields.
  • This study provides fundamental insights into the photophysical mechanisms of Al(III) complexes.
  • A conceptual framework is established for designing advanced photofunctional materials by controlling dynamic symmetry changes.