Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Surface Reactions and Heterogeneous Catalysis 3
O 79.6: Vortrag
Freitag, 9. September 2022, 12:00–12:15, H4
Interplay between π-conjugation and exchange magnetism in one-dimensional porphyrinoid polymers — •Kalyan Biswas1, Maxence Urbani1, Ana Sánchez-Grande1, Diego Soler2, Koen Lauwaet1, Adam Matěj2, Pingo Mutombo2, José M. Gallego1, Rodolfo Miranda1, David Écija1, Pavel Jelínek2, Tomás Torres1, and José I. Urgel1 — 1IMDEA Nanoscience, Madrid, Spain — 2CATRIN, Olomouc, Czech Republic
The field of carbon magnetism has gained an increased attention in view of the recent progress made in the synthesis and characterization of open-shell polycyclic aromatic hydrocarbons following a bottom-up synthetic approach. In this work, we introduce an exemplary approach toward the bottom-up fabrication of unprecedented magnetic porphyrinoid-based polymers homocoupled via surface-catalyzed [3 + 3] cycloaromatization of isopropyl substituents studied on Au(111) under ultra-high vacuum conditions. The chemical structure of the polymer, formed by thermal-activated intra- and intermolecular oxidative ring closure reactions followed by controlled tip-induced hydrogen dissociation from the porphyrinoid units, have been clearly elucidated by scanning tunneling microscopy and non-contact atomic force microscopy. Scanning tunneling spectroscopy, complemented by computational investigations reveals the antiferromagnetic singlet ground state (S=0), which display singlet-triplet inelastic excitations observed between spins of adjacent porphyrinoid units only along a specific π-conjugation pathway. We envision that our approach can be a highly relevant in nanoscale spintronic devices.