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    • Femtosecond Spin-State Switching Dynamics of Fe(II) Complexes Condensed in Thin Films.

    Lea Kaemmerer, Gerald Kaemmerer，Uwe Bovensiepen,Heiko Wende

    ACS NANO（2024）

    Univ Duisburg Essen

    Cited 0|Views3
    Abstract
    The tailoring of spin-crossover films has made significant progress over the past decade, mostly motivated by the prospect in technological applications. In contrast to spin-crossover complexes in solution, the investigation of the ultrafast switching in spin-crossover films has remained scarce. Combining the progress in molecule synthesis and film growth with the opportunities at X-ray free-electron lasers, we study the photoinduced spin-state switching dynamics of a molecular film at room temperature. The subpicosecond switching from the S = 0 low-spin ground state to the S = 2 high-spin state is monitored by analyzing the transient evolution of the Fe L3 X-ray absorption edge fine structure, i.e. element-specifically at the switching center of the Fe(II) complex. Our measurements show the involvement of an intermediate state in the switching. At large excitation fluences, the fraction of high-spin molecules saturates at approximate to 50%, which is likely due to molecule-molecule interaction within the film.
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    Key words
    spin crossover,ultrafast switching,molecularfilm,X-ray free-electron laser,time-resolved X-rayabsorption spectroscopy
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