G. Kladnik1,2,§, L. Schio2,§, G. Bavdek2,3,§, Y. Tanuma4, M. van Midden Mavrič4, E. Zupanič4, B. Anézo4,5, I.K. Sideri6, N. Tagmatarchis6, J. Volkmann7,8, H.A. Wegner7,8, A. Goldoni9, C.P. Ewels5, A. Morgante2,10, L. Floreano2, D. Arčon1,4, D. Cvetko1,2,4 1 Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia 2 CNR - Istituto Officina dei Materiali (IOM), TASC Laboratory, Trieste, Italy 3 Faculty of Education, University of Ljubljana, Ljubljana, Slovenia 4 Jožef Stefan Institute, Ljubljana, Slovenia 5 Institut des Matériaux de Nantes Jean Rouxel (IMN), Nantes University, Nantes, France 6 Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation Athens, Greece 7 Institute of Organic Chemistry, Justus Liebig University Giessen, Giessen, Germany 8 Center for Materials research (ZfM/LaMa), Giessen, Germany 9 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy 10 Physics department, University of Trieste, Trieste, Italy § G.K., L.S. and G.B. contributed equally to this work e-mail: dean.cvetko@fmf.uni-lj.si; gregor.kladnik@fmf.uni-lj.si; denis.arcon@ijs.si Acknowledgments We acknowledge financial support by the Japanese JSPS Overseas Research Fellowship, the Slovenian Research Agency (J1-3007, J22514, N1-0220 and P1-0112, P1-0125, P1-0099), the EUR LUMOMAT project and the Investments for the Future ANR-18-EURE-0012, the PHC Proteus Agreement 46151XJ and the ministries MEAE and MESR, the COST Action CA21126. Part of this study was carried out within the National Quantum Science and Technology Institute and received funding from the European Union NextGeneration EU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR)— MISSIONE 4 COMPONENTE 2, INVESTIMENTO 1.3—PE_00000023). Partial funding from the EU’s Horizon 2020 research and innovation program (grant No 101007417), within the framework of the NFFA-Europe Pilot Transnational Access Activity (ID447, at CNR-IOM Trieste). DFT calculations were performed at the CCIPL (Centre de Calcul Intensif des Pays de la Loire) and HPC facilities of FMF, University of Ljubljana. Original paper G. Kladnik et al., Nat. Commun. 16, 193 (2025). DOI: 10.1038/s41467-024-55521-2. Fig. 1 Figure 1. STM topographic images of (a) supramolecular template of [10]CPP nano-cavities for trapping azafullerene (C59N•) radicals on Au(111); (b) RT deposited C59N• on-top of [10]CPP template layer; (c) heterolayer after temperature annealing to 320 °C showing extended 2D networks of encapsulated radicals – a single complex is indicated with a red circle and shown as a DFT calculated on-surface complex C59N• [10]CPP; (d) high resolution image of single encapsulated C59N• [10]CPP assembly showing central azafullerene and circular [10]CPP with 10-fold phenyl ring structure. (e) Nitrogen K-edge NEXAFS of C59N• [10]CPP layer with highlighted SUMO peak due to radical molecules; (f) N K-edge NEXAFS after annealing demonstrating radical stability as no reduction of SUMO is observed. ∩ ∩ ∩ RT 320˚C C59N• ⸦[10]CPP a) b) c) d) 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) 1ML C59N magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) 1ML C59N @ 240C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) C59N•<[10]CPP magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) C59N•<[10]CPP T=300C magic SUMO LUMO s-pol p-pol a) b) c) d) 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) 1ML C59N magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) 1ML C59N @ 240C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) C59N•<[10]CPP magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) C59N•<[10]CPP T=300C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) 1ML C59N magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) 1ML C59N @ 240C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) C59N•<[10]CPP magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) C59N•<[10]CPP T=300C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) 1ML C59N magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) 1ML C59N @ 240C magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) NEXAFS (arb.units) C59N•<[10]CPP magic SUMO LUMO s-pol p-pol 415 410 405 400 Photon energy (eV) C59N•<[10]CPP T=300C magic SUMO LUMO s-pol p-pol (a) (b) (c) (d) (e) (f) Surfaces and Interfaces Elettra Highlights 2024–2025 117
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