SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Poster Session VII: Surface reactions I

O 90.8: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

On-surface synthesis of diradical organic one-dimensional polymers — •Ana Sánchez-Grande¹, José I. Urgel¹, Ales Cahlík², José Santos^1,3, Shayan Edalatmanesh², Koen Lauwaet¹, Pingo Mutombo², Bruno de la Torre², Rodolfo Miranda^1,4, Oliver Gröning⁵, Nazario Martín^1,3, Pavel Jelínek², and David Écija¹ — ¹C/ Faraday 9, Campus de Cantoblanco. 28049 Madrid (Spain) — ²Institute of Physics of the Czech Academy of Science, 6253 Praha (Czech Republic) — ³ltad de Ciencias Químicas, Universidad Complutense de Madrid. 28040 Madrid (Spain) — ⁴Departamento de Física de la Materia Condensada, UniversidadAutónoma de Madrid, 28049 Madrid (Spain) — ⁵Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf (Switzerland)

In this work, we present the on-surface synthesis of one-dimensional polymers based on cumulene-bridged peripentacene units on a bare Au(111) surface under ultra-high-vacuum (UHV) conditions. The structural characterization of the polymers has been realized via scanning tunneling microscopy (STM) and confirmed by non-contact atomic force microscopy (nc-AFM). The electronic characterization of polymers has been performed via scanning tunneling spectroscopy (STS) which, complemented by theoretical calculations, reveals that the polymers present an experimental band gap of 0.8 eV and pure diradical character, exhibiting one unpaired spin at each end. We observe a transition from an antiferromagnetic ground state for peripentacene dimers to a paramagnetic ground state for trimers or longer polymers.