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Adsorption and coupling of 4-aminophenol on Pt(111) surfaces

AuthorsOtero, Gonzalo ; Martínez, José I. ; Bueno, Rebeca A.; Palomares, F. Javier ; Salavagione, Horacio J. ; Singh, M. K.; Méndez, J.; Ellis, Gary James ; López, María Francisca ; Martín-Gago, José A.
On-surface synthesis
Issue DateApr-2016
CitationSurface Science 646: 5-12 (2016)
AbstractWe have deposited 4-aminophenol on Pt(111) surfaces in ultra-high vacuum and studied the strength of its adsorption through a combination of STM, LEED, XPS and ab initio calculations. Although an ordered (2√3 × 2√3)R30° phase appears, we have observed that molecule–substrate interaction dominates the adsorption geometry and properties of the system. At RT the high catalytic activity of Pt induces aminophenol to lose the H atom from the hydroxyl group, and a proportion of the molecules lose the complete hydroxyl group. After annealing above 420 K, all deposited aminophenol molecules have lost the OH moiety and some hydrogen atoms from the amino groups. At this temperature, short single-molecule oligomer chains can be observed. These chains are the product of a new reaction that proceeds via the coupling of radical species that is favored by surface diffusion.
Publisher version (URL)https://doi.org/10.1016/j.susc.2015.08.039
Appears in Collections:(ICMM) Artículos
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