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Identifying electron transfer coordinates in donor-bridge-acceptor systems using mode projection analysis.

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  • 1Department of Chemistry, University of Houston, Houston, Texas 77204, USA.

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Summary
This summary is machine-generated.

Vibrational modes in a donor-bridge-acceptor system significantly influence electron transfer. Asymmetric acetylene modes enhance charge recombination more than charge separation.

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Area of Science:

  • Photochemistry
  • Molecular dynamics
  • Quantum chemistry

Background:

  • Understanding electron transfer dynamics is crucial for designing molecular devices.
  • Vibrational modes play a key role in mediating electronic transitions.
  • Donor-bridge-acceptor (DBA) systems provide a platform to study these processes.

Purpose of the Study:

  • To analyze the vibrational modes that couple and drive state-to-state electronic transfer branching ratios.
  • To investigate the role of specific vibrational modes in charge-separation and charge-recombination processes.
  • To elucidate the mechanism of electron transfer in a model DBA system.

Main Methods:

  • Iterative Lanczos search algorithm to identify vibronic modes.
  • Excited-state quantum chemical calculations to obtain input data.
  • Analysis of vibrational mode contributions to electron/nuclear coupling.

Main Results:

  • Asymmetric and symmetric modes of acetylene groups dominate electron transfer reaction coordinates.
  • A nearly symmetric mode equally couples charge-separation and charge-recombination.
  • An asymmetric mode shows significantly greater coupling, favoring charge-recombination.

Conclusions:

  • Vibrational mode control is essential for tuning electron transfer pathways.
  • Infrared (IR) excitation of acetylene modes can preferentially enhance charge-recombination.
  • This finding has implications for controlling charge dynamics in molecular systems.