This talk will report on the relaxation dynamics in a series of derivatives of the iron(II) complex [Fe(terpy)2]2+ in solution following photo-excited metal to ligand charge transfer (MLCT) excitation. Especially for solar energy harvesting applications, the ultrafast relaxation mechanisms from the initially excited ligand-localized state(s) to the final metal-centered state(s) are of key importance. This presentation will describe the ultrafast X-ray experiments performed at the LCLS X-ray Free Electron laser. Via these measurements, information on the pathway taken by the photo-excited molecules through the often large number of energetically available electronic states was tracked with X-ray solution scattering on femtosecond timescales. Simultaneously, we tracked the spin-state dynamics via X-ray Emission Spectroscopy.

Excited-state structural and spin-state dynamics in Fe(terpy)2 derivatives measured with sub-picosecond time-resolved X-ray scattering and X-ray emission spectroscopy

ACS Spring 2022

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