Jump to main content
Jump to site search

Issue 30, 2015
Previous Article Next Article

Femtosecond spin-state photo-switching dynamics in an FeIII spin crossover solid accompanied by coherent structural vibrations

Author affiliations

Abstract

We investigate light-induced excited spin-state trapping (LIESST) dynamics of an FeIII spin-crossover material from low (S = 1/2) to high (S = 5/2) spin states. Our results show that this process occurs only at the molecular level as evidenced by the linear dependence of the fraction of photo-switched molecules with the excitation density as well as with the initial fraction of low spin molecules. The inter-system crossing from photoexcited LS (S = 1/2) to HS (S = 5/2) occurs within ≈200 fs and is accompanied by coherent non-equilibrium vibrational relaxation in the photo-induced HS state. These results reveal similar dynamical features to those already reported for LIESST in FeII systems. The activation of coherent molecular vibrations is essential for rapidly reaching the HS potential on the timescale of molecular motions, whereas their fast damping allows an efficient trapping in the HS potential. The observed coherent oscillations are attributed to photoinduced molecules in the HS states, as supported by Raman spectroscopy at thermal equilibrium, and DFT analyses of molecular vibrations and TD-DFT calculations of optical absorption.

Graphical abstract: Femtosecond spin-state photo-switching dynamics in an FeIII spin crossover solid accompanied by coherent structural vibrations

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Mar 2015, accepted on 05 May 2015 and first published on 06 May 2015


Article type: Communication
DOI: 10.1039/C5TC00854A
Author version
available:
Download author version (PDF)
Citation: J. Mater. Chem. C, 2015,3, 7792-7801
  •   Request permissions

    Femtosecond spin-state photo-switching dynamics in an FeIII spin crossover solid accompanied by coherent structural vibrations

    R. Bertoni, M. Lorenc, J. Laisney, A. Tissot, A. Moréac, S. F. Matar, M.-L. Boillot and E. Collet, J. Mater. Chem. C, 2015, 3, 7792
    DOI: 10.1039/C5TC00854A

Search articles by author

Spotlight

Advertisements