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Spin-Vibronic Effect in Photoinduced Electron Transfer.

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The spin-vibronic effect (SVE) accelerates forbidden electronic transitions. This study reveals SVE directs photoinduced electron transfer dynamics in Pt(II) complexes, influencing vibrational wavepackets and charge separation.

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Area of Science:

  • Physical Chemistry
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Spin-vibronic effect (SVE) enhances quantum-mechanically forbidden electronic transitions.
  • Experimental evidence for SVE in photoinduced electron transfer (PET) is scarce.

Purpose of the Study:

  • Investigate SVE's role in PET dynamics using coherent vibrational wavepacket (CVWP) motions.
  • Probe SVE modulation of CVWP dynamics in Pt(II) dimer-naphthalene diimide donor-acceptor complexes.

Main Methods:

  • Utilized ultrafast spectroscopy to observe PET dynamics.
  • Analyzed CVWP motions following metal-metal-to-ligand charge-transfer (MMLCT) excitation.
  • Identified reaction coordinates through Herzberg-Teller oscillations.

Main Results:

  • Ballistic PET was triggered by MMLCT excitation, moving the system from equilibrium.
  • SVE directed PET from the 1MMLCT state to a triplet intermediate state.
  • Pt-Pt stretching vibration was identified as the charge separation reaction coordinate.

Conclusions:

  • SVE significantly influences ultrafast PET dynamics by modulating CVWP motions.
  • The interplay of electronic, vibrational, and spin degrees of freedom is crucial for photoactivated processes.
  • Experimental findings provide new insights into SVE mechanisms in donor-acceptor systems.