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Novel iron(II) complexes with N-heterocyclic carbene ligands show potential as photosensitizers. Their excited-state decay is dominated by intersystem crossing, with slower conversion to metal-centered states, enhancing photosensitizer suitability.

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Area of Science:

  • Inorganic Chemistry
  • Photochemistry
  • Computational Chemistry

Background:

  • Iron(II) complexes are typically poor photosensitizers due to low-lying metal-centered (MC) states.
  • These MC states hinder efficient electron transfer processes crucial for photosensitization.

Purpose of the Study:

  • To investigate the excited-state relaxation dynamics of a novel iron(II) complex.
  • To understand how N-heterocyclic carbene ligands influence the metal-centered states and photosensitizer potential.

Main Methods:

  • Utilized first-principles quantum nuclear wavepacket simulations.
  • Analyzed the photoexcited decay mechanism and intersystem crossing pathways.

Main Results:

  • The excited-state decay is primarily driven by ultrafast intersystem crossing from singlet metal-to-ligand charge transfer ((1)MLCT) to triplet MLCT ((3)MLCT) states.
  • Slower kinetics involve conversion to triplet metal-centered ((3)MC) states.
  • The slowest (3)MLCT decay component is significantly longer than in related complexes due to inefficient population transfer to (3)MC states.

Conclusions:

  • The designed N-heterocyclic carbene ligands destabilize the (3)MC states, prolonging the (3)MLCT lifetime.
  • This enhanced lifetime suggests potential for these iron(II) complexes in photosensitization applications.
  • The study provides a detailed mechanistic insight into the excited-state behavior of these novel photosensitizers.