| Autor: |
Ayani CG; Dep Física de la Materia Condensada, Universidad Autónoma de Madrid, Cantoblanco 28049, Madrid, Spain. fernando.martin@uam.es al.vazquezdeparga@uam.es., Pisarra M, Urgel JI, Navarro JJ, Díaz C, Hayashi H, Yamada H, Calleja F, Miranda R, Fasel R, Martín F, Vázquez de Parga AL |
| Jazyk: |
angličtina |
| Zdroj: |
Nanoscale horizons [Nanoscale Horiz] 2021 Sep 01; Vol. 6 (9), pp. 744-750. Date of Electronic Publication: 2021 Jun 24. |
| DOI: |
10.1039/d1nh00184a |
| Abstrakt: |
The on-surface photogeneration of nonacene from α-bisdiketone precursors deposited on nanostructured epitaxial graphene grown on Ru(0001) has been studied by means of low temperature scanning tunneling microscopy and spectroscopy. The presence of an unoccupied surface state, spatially localized in the regions where the precursors are adsorbed, and energetically accessible in the region of the electromagnetic spectrum where n-π* transitions take place, allows for a 100% conversion of the precursors into nonacenes. With the help of state-of-the-art theoretical calculations, we show that such a high yield is due to the effective population of the surface state by the incoming light and the ensuing electron transfer to the unoccupied states of the precursors through an inelastic scattering mechanism. Our findings are the experimental confirmation that surface states can play a prominent role in the surface photochemistry of complex molecular systems, in accordance with early theoretical predictions made on small molecules. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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