Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Monday: Organic Molecules at Surfaces 1
O 17.11: Poster
Montag, 5. September 2022, 18:00–20:00, P4
C60 - PEN Diels - Alder Cycloaddition Reaction on Ag(110) — •Mohammed Suhail Ansari, Ravi Priya, and Peter Jakob — Department of Physics, Philipps - Universität Marburg, Germany
Ultrathin films of C60 and pentacene (PEN) have been prepared on Ag(110) and their vibrational properties, as well as thermal evolution investigated by IR spectroscopy. Monolayer species are found to display distinctly different vibrational signatures as compared to higher layers, so the characterization of the grown hetero layers is straightforward. Moreover, the excellent spectral resolution and chemical selectivity allowed us to unambiguously identify the C60 - PEN Diels-Alder adduct [1]. In our thermal evolution study, the formation and decomposition of the C60 - PEN reaction product as well as the abundances of the C60 and PEN compounds have been examined. Production of the adduct species requires a weak thermal activation (annealing to 350 K) and proceeds largely independent of the C60 / PEN stacking sequence. We find that this reaction occurs exclusively at the (abrupt) interface of C60 and PEN for layered arrangements and is fully reversible, meaning that further annealing to 450 K (and higher) produces again C60 and PEN, with the latter desorbing thermally and thus depleting the initial concentration of reactants.
[1] F. Cataldo, D. A. García-Hernández and A. Manchado, On the C60 Fullerene Adduct with Pentacene: Synthesis and Stability, Fullerenes, Nanot. Carbon Nanostruct. 23 (2015) 818-823.