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Area of Science:

  • Physical Chemistry
  • Molecular Biophysics
  • Materials Science

Background:

  • Electron transfer is fundamental to many chemical and biological processes.
  • Typically, reaction rates decrease as the distance between electron donor and acceptor increases.
  • Understanding distance-dependent electron transfer is crucial for designing efficient energy conversion systems.

Purpose of the Study:

  • To investigate electron transfer rates at extended donor-acceptor distances.
  • To explore the relationship between molecular structure and electron transfer efficiency in rigid systems.
  • To reconcile experimental findings with existing electron transfer theories.

Main Methods:

  • Synthesis of three homologous series of rigid-rod-like donor-photosensitizer-acceptor triads with p-xylene bridges.
  • Experimental measurement of thermal electron transfer rates.
  • Analysis of donor-acceptor coupling and reorganization energy.

Main Results:

  • Observed maxima in electron transfer rates at donor-acceptor separations of 30.6 Å.
  • Demonstrated a weak distance dependence of electronic coupling.
  • Showcased a strong increase in outer-sphere reorganization energy with increasing distance.

Conclusions:

  • Experimental results align with theoretical predictions of electron transfer dynamics.
  • The findings highlight the complex interplay between coupling and reorganization energy.
  • The observed phenomenon has significant implications for optimizing light-to-chemical energy conversion technologies.