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O: Fachverband Oberflächenphysik
O 90: Poster Session VII: Surface reactions I
O 90.8: Poster
Thursday, March 4, 2021, 10:30–12:30, P
On-surface synthesis of diradical organic one-dimensional polymers — •Ana Sánchez-Grande1, José I. Urgel1, Ales Cahlík2, José Santos1,3, Shayan Edalatmanesh2, Koen Lauwaet1, Pingo Mutombo2, Bruno de la Torre2, Rodolfo Miranda1,4, Oliver Gröning5, Nazario Martín1,3, 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.