Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation II
O 51.3: Vortrag
Mittwoch, 20. März 2024, 15:45–16:00, HE 101
Tuning the spin coupling in all-organic diradicals through mechanical manipulation — •Alessio Vegliante1, Saleta Fernandez2, Manuel Vilas-Varela2, Ricardo Ortiz3, Thomas Baum4, Niklas Friedrich1, Francisco R. Lara1, Herre van der Zant4, Thomas Frederiksen3, Diego Peña2, and Jose Ignacio Pascual1 — 1CIC NanoGUNE, Spain — 2CiQUS-USC, Spain — 3DIPC, Spain — 4TU Delft, the Netherlands
Open-shell organic molecules have emerged as promising candidates for carbon-based spintronics. Organic diradicals, in particular, are interesting model systems for studying and manipulating intramolecular spin interactions at the atomic scale.
Here we report the tunable spin interactions of the molecular diradical 2OS on a Au(111) substrate using scanning tunneling microscopy and spectroscopy. 2OS is stable diradical, derivative of the Chichibabin*s hydrocarbon, characterized by a non-planar and flexible structure. With the support of theoretical calculations, we show that the spin interaction strongly depends on the structural conformation of the molecule: the adsorption on the Au surface induces a partial planarization that stabilizes a singlet ground state, while less planar conformations exhibit a significantly reduced spin coupling.
In this work, we demonstrate the possibility of tailoring the spin interaction through structural changes induced by approaching the STM tip or lifting the molecule from the substrate, thus confirming the influence of geometry on the molecule*s spin state.
Keywords: spin interaction; organic molecules; scanning probe microscopy; manipulation