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Area of Science:

  • Photochemistry
  • Molecular Photophysics
  • Organic Electronics

Background:

  • Photoinduced electron transfer (PET) is crucial for energy conversion.
  • Rigid oligo-p-phenylenes have been studied for PET, but ortho-linked systems remain unexplored.
  • Understanding PET in flexible molecular architectures is key for developing new energy materials.

Purpose of the Study:

  • To investigate photoinduced electron transfer in molecular dyads with flexible ortho-phenylene bridges.
  • To synthesize and characterize novel donor-acceptor systems linked by 2-6 ortho-phenylene units.
  • To compare the energy storage capabilities and photoproduct lifetimes of flexible versus rigid systems.

Main Methods:

  • Synthesis of triarylamine-Ru(bpy)3^2+ dyads with varying ortho-phenylene linker lengths.
  • Pulsed laser excitation at 532 nm to initiate photoinduced electron transfer.
  • Transient absorption spectroscopy to monitor electron transfer kinetics and photoproduct lifetimes.

Main Results:

  • Intramolecular electron transfer from triarylamine to Ru(bpy)3^2+ upon excitation.
  • Formation of long-lived photoproducts storing ~1.7 eV of energy.
  • Reverse charge-shift reaction occurs on a 120-220 ns timescale, exhibiting single-exponential decay.
  • Flexible ortho-phenylene bridges do not hinder photoproduct lifetimes.

Conclusions:

  • Flexible ortho-phenylene linkers facilitate efficient photoinduced electron transfer and energy storage.
  • The conformational flexibility of ortho-phenylenes is compatible with long-lived photoproducts, similar to rigid systems.
  • These findings are significant for advancing light-to-chemical energy conversion technologies.