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O: Fachverband Oberflächenphysik

O 20: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I

O 20.4: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, HE 101

On-Surface Stepwise Double Dehydrogenation for the Formation of an Undecacene Isomer — •Suchetana Sarkar¹, Kwan Ho Au-Yeung¹, Berta Álvarez^2,3, Agustín Cobas³, Roberto Robles⁴, Nicolas Lorente^4,5, Diego Peña^2,3, Dolores Pérez^2,3, and Francesca Moresco¹ — ¹Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — ²Centro de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain — ³Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain — ⁴Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain — ⁵Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain

We present the on-surface synthesis of an isomer of undecacene bearing two four-membered rings and two para-quinodimethanes. The transformation involves a thermal double deoxygenation followed by on-surface stepwise double dehydrogenation reaction of the methyl groups, locally induced by inelastic tunneling electrons on an Au (111) substrate. The structure and electronic properties of the intermediates and the final product have been investigated at the single molecule level with high spatial resolution, using both low temperature scanning tunneling microscopy/spectroscopy and non-contact atomic force microscopy. The experimental results are supported by density functional theory calculations.

Keywords: LT-STM, nC-AFM; Inelastic tunneling; Acenes; On-surface reaction; Dehydrogenation