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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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Light-induced charge transfer in a molecular cage enables ultrafast proton-coupled electron-transfer (PCET) reactions. This method offers temporal control over reaction pathways, stabilizing intermediates for potential applications in visible-light photocatalysis.

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Area of Science:

  • Supramolecular Chemistry
  • Photochemistry
  • Physical Chemistry

Background:

  • Proton-coupled electron-transfer (PCET) reactions are fundamental in chemistry and biology.
  • Controlling PCET reaction pathways and timescales remains a significant challenge.
  • Nanoconfined environments offer unique opportunities to modulate chemical reactivity.

Purpose of the Study:

  • To investigate the triggering of PCET reactions using light within a nanoconfined host.
  • To explore the temporal control over reactive pathways via kinetic stabilization of intermediates.
  • To demonstrate a novel approach for visible-light photocatalysis.

Main Methods:

  • Utilized a water-soluble octahedral Pd6L4 molecular cage as a host environment.
  • Employed optical pumping of host-guest charge transfer (CT) states.
  • Conducted femtosecond broadband transient absorption spectroscopy to study reaction dynamics.

Main Results:

  • Optical pumping of CT states generated a kinetically stable phenoxyl radical of 4-hydroxy-diphenylamine (1-OH).
  • CT excitation initiated proton transfer from the 1-OH radical cation to a solvent water molecule in approximately 890 fs.
  • This proton transfer occurred faster than bulk solvation timescales.

Conclusions:

  • Host-guest CT excitations can drive solvent-coupled ultrafast PCET reactions within nanocages.
  • This approach provides temporal control over PCET reaction pathways.
  • Optimized tuning of this system could establish a new paradigm for visible-light photocatalysis.