Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties II
O 97.7: Vortrag
Freitag, 21. März 2025, 12:00–12:15, H6
Magnetic Coupling in Triangulene Dimers: Impact of Number and Dihedral Angles of para-Biphenyl Linkers — •Marco Lozano1, Elena Perez-Elvira2, Qiang Huang3, Ji Ma3, Aurelio Gallardo2, Ana Barragan2, Alba Garcia-Frutos2, Koen Lauwaet2, Jose Gallego4, Pavel Jelinek1, David Ecija2, Diego Soler-Polo1, and Jose Urgel2 — 1Institute of Physics of the Czech Academy of Science, CZ-16253 Praha, Czech Republic — 2IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain — 3Center for Advancing Electronics Dresden (cfaed) & Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01069 Dresden, Germany — 4Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Cantoblanco, 28049 Madrid, Spain
Triangulene and its homologues are promising building blocks for high-spin low-dimensional networks with long-range magnetic order. Despite the recent progress in the synthesis and characterization of coupled triangulenes, key parameters such as the number or the dihedral angles of organic linking units remain scarce, making further studies crucial for an essential understanding of their implications. Here, we investigate the synthesis of two triangulene dimers linked by two or one para-biphenyl units on a metal surface in an UHV environment. First-principles calculations and model Hamiltonians reveal how the spin excitation and radicalism depend on the rotation of the para-biphenyl units.
Keywords: π-electron magnetism; open-shell character; scanning tunneling microscopy; triangulene; scanning tunneling spectroscopy