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Researchers optimized photon-to-heat conversion using E-Z photoisomerisation in methyl cinnamate derivatives. Substitutions accelerate excited-state decay, enabling efficient light-energy conversion for various applications.

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Area of Science:

  • Photochemistry
  • Molecular Spectroscopy
  • Biophysics

Background:

  • E-Z photoisomerisation is crucial for biological functions like vision and photoprotection.
  • Understanding excited-state decay pathways is key to controlling light energy conversion.

Purpose of the Study:

  • To optimize photon-to-heat conversion processes by studying E-Z photoisomerisation in methyl cinnamate derivatives.
  • To investigate how steric and electronic substitutions influence excited-state decay dynamics.

Main Methods:

  • Synthesis of methyl cinnamate derivatives with specific substitutions.
  • Femtosecond spectroscopy in solution and gas phase.
  • Multireference quantum chemical calculations to determine potential energy surfaces.

Main Results:

  • Para-methoxy substitution facilitates access to conical intersections.
  • Steric hindrance promotes barrierless pathways for ground-state recovery.
  • Achieved isomerisation timescales comparable to cis-11-retinal.

Conclusions:

  • Substitution patterns dictate nonradiative decay rates in cinnamate scaffolds.
  • Identified mechanisms for accelerating nonradiative decay.
  • Paved the way for rational design of efficient photon converters.