What question did this study set out to answer?

This research aims to elucidate the dynamics of spin crossover in an iron(II) carbene complex through vibronic and spin-orbit interplay.

April 4, 2026ChemPhysChem

Vibronic and Spin–Orbit Interplay Governs Ultrafast Spin Crossover in an Iron(II) Carbene Complex

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Theoretical investigation reveals ultrafast spin crossover dynamics in iron carbene complexes, suggesting new insights for photosensitizers.

This research aims to elucidate the dynamics of spin crossover in an iron(II) carbene complex through vibronic and spin-orbit interplay.
Theoretical investigation using ab initio electronic structure calculations
Hierarchical equations of motion simulations
Analysis of population transfer following MLCT excitation
Identified sub-100 fs intersystem crossing from singlet to triplet MLCT states
Extended MLCT lifetime to several picoseconds due to raised MC state energies
Vibronic coupling identified as the main mechanism for efficient crossing.

Gao et al. (2026) studied this question.

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Theoretical investigation reveals ultrafast spin crossover dynamics in iron carbene complexes, suggesting new insights for photosensitizers.