Thin films of an iron(ii) complex with a photochromic diarylethene-based ligand and featuring a spin-crossover behaviour have been grown by sublimation in ultra-high vacuum on highly oriented pyrolytic graphite and spectroscopically characterized through high-resolution X-ray and ultraviolet photoemission, as well as via X-ray absorption. Temperature-dependent studies demonstrated that the thermally induced spin-crossover is preserved at a sub-monolayer (0.7 ML) coverage. Although the photochromic ligand ad hoc integrated into the complex allows the photo-switching of the spin state of the complex at room temperature both in bulk and for a thick film on highly oriented pyrolytic graphite, this photomagnetic effect is not observed in sub-monolayer deposits. Ab initio calculations justify this behaviour as the result of specific adsorbate-substrate interactions leading to the stabilization of the photoinactive form of the diarylethene ligand over photoactive one on the surface.
Surface effects on a photochromic spin-crossover iron(ii) molecular switch adsorbed on highly oriented pyrolytic graphite / Poggini, Lorenzo; Londi, Giacomo; Milek, Magdalena; Naim, Ahmad; Lanzilotto, Valeria; Cortigiani, Brunetto; Bondino, Federica; Magnano, Elena; Otero, Edwige; Sainctavit, Philippe; Arrio, Marie-Anne; Juhin, Amélie; Marchivie, Mathieu; Khusniyarov, Marat M; Totti, Federico; Rosa, Patrick; Mannini, Matteo. - In: NANOSCALE. - ISSN 2040-3364. - STAMPA. - 11:(2019), pp. 20006-20014-20014. [10.1039/c9nr05947d]
Surface effects on a photochromic spin-crossover iron(ii) molecular switch adsorbed on highly oriented pyrolytic graphite
Poggini, Lorenzo
;Lanzilotto, Valeria;Cortigiani, Brunetto;Totti, Federico
;Mannini, Matteo
2019
Abstract
Thin films of an iron(ii) complex with a photochromic diarylethene-based ligand and featuring a spin-crossover behaviour have been grown by sublimation in ultra-high vacuum on highly oriented pyrolytic graphite and spectroscopically characterized through high-resolution X-ray and ultraviolet photoemission, as well as via X-ray absorption. Temperature-dependent studies demonstrated that the thermally induced spin-crossover is preserved at a sub-monolayer (0.7 ML) coverage. Although the photochromic ligand ad hoc integrated into the complex allows the photo-switching of the spin state of the complex at room temperature both in bulk and for a thick film on highly oriented pyrolytic graphite, this photomagnetic effect is not observed in sub-monolayer deposits. Ab initio calculations justify this behaviour as the result of specific adsorbate-substrate interactions leading to the stabilization of the photoinactive form of the diarylethene ligand over photoactive one on the surface.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.