SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session III: Organic molecules on inorganic substrates: Adsorption and growth III

O 34.6: Poster

Dienstag, 2. März 2021, 10:30–12:30, P

Self--assembly and metalation of a novel macrocyclic biquinazoline compound on Ag(111) — •Felix Haag¹, Peter S. Deimel¹, Peter Knecht¹, Raphael Lauenstein², Manuel Kaspar², Knud Seufert¹, Yang Bao¹, Marc Gonzalez Cuxart¹, Anthoula C. Papageorgiou¹, Corinna Hess², Willi Auwärter¹, Johannes V. Barth¹, and Francesco Allegretti¹ — ¹Physics Department E20, Technical University Munich, Germany — ²Chemistry Deparment, Technical University Munich, Germany

We report the first experimental study of the adsorption of the macrocyclic biquinazoline (H-Mabiq) compound on a model solid surface. Its two potential coordination sites for metal ions, combined with multi--electron transfer capacity ensure higher sophistication beyond the well--studied metallo--porphyrins and --phthalocyanines. As the coordination sites can be occupied by different metal atoms, adsorbed Mabiq complexes are promising candidates for photocatalytic applications and epoxidation reactions. Here, we present the self--assembly, on--surface binding and chemical state of H-Mabiq on Ag(111) by employing a toolbox of surface science techniques including XPS, NEXAFS, LEED, STM and TPD. We establish protocols for the preparation of well--ordered single layers and the controlled metalation with Co atoms. The ordering and packing of the pristine H-Mabiq single layer depend critically on the substrate temperature, evidenced through distinct changes in the LEED pattern and STM topography upon annealing. Moreover, the effect of Co deposition on the self--assembly and chemical state of the molecules is discussed.