Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy
O 51.3: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Unravelling the Magnetic Ground State of All-Organic Diradicals on Au Substrates — •Alessio Vegliante1, Saleta Fernandez2, Ricardo Ortiz3, Niklas Friedrich1, Andrea Aguirre1, Francisco Romero1, Diego Peña2, and Thomas Frederiksen3 — 1CIC NanoGUNE, San Sebastian, Spain — 2CiQUS-USC, Santiago de Compostela, Spain — 3Donostia International Physics Center, San Sebastian, Spain
Open-shell organic molecules have received considerable interest as potential candidates for molecular spintronics. Magnetism can emerge in all-organic molecules due to the presence of one or more unpaired π-electrons. Organic diradicals, hosting two spin centers, are particularly interesting as model systems for investigating and manipulating magnetic interactions at the atomic scale.
Here we study the magnetic state of a Chichibabin*s hydrocarbon diradical deposited on a gold substrate, by using scanning tunneling microscopy (STM) and spectroscopy (STS). We investigate the interaction between the two spin centers of the molecule, focusing on the influence of the molecular geometry. With the support of theoretical simulations, we show that the adsorption on the metal surface changes the ground state of the molecule from a triplet, expected in the gas phase, to a singlet state. Furthermore, we demonstrate that it is possible to modify the magnetic state of the diradical through conformational changes induced by the STM tip. These findings represent an important step towards the control of magnetic interactions within purely organic molecules.