Sub-monolayer deposit of photochromic Spin Crossover compound on HOPG
Résumé
Thin films of a molecular spin crossover iron(II) complex featuring a photochromic diarylethene-based ligand have been grown by sublimation in ultra-high vacuum on an highly oriented pyrolytic graphite (HOPG), and investigated by X-ray and UV photoelectron spectroscopies as well as by X-ray absorption spctroscopy. Temperature-dependent studies demonstrate that the thermally induced spin crossover behaviour is preserved in a sub-monolayer coverage. The photochromic ligand ad hoc integrated into the complex allows photoswitching of the spin states of this iron(II) complex at room temperature but our evidences suggest that this photomagnetic effect is not observed in 0.7ML sublimated films. Ab initio simulations performed on the adsorbed molecules justify this behaviour as the result of geometry of the molecules iteracting with the graphite.
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