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00925njm 22002777a 4500 dc Solà i Puig, Miquel author Szczepanik, Dariusz W. author 2025-09-25 Preprint in: ChemRxiv, 2025, https://doi.org/10.26434/chemrxiv-2025-tzc36 Aquesta és una versió no revisada per experts de l'article publicat per De GruyterBrill a 'Pure and Applied Chemistry', publicat en línia el 15 d'abril de 2025 i disponible a https://doi.org/10.1515/pac-2025-0465 To celebrate the International Year of Quantum Science and Technology (IYQ), we discuss how the concept of aromaticity emerges from the postulates of quantum mechanics. Based on this discussion, we analyze the case of cyclo [18]carbon, a molecule that was characterized for the first time in 2019 in a scanning tunneling microscope. From the very beginning, this molecule was classified as an aromatic molecule. In the present work, we challenge this classification and provide arguments to classify this molecule as a non-aromatic species Funding source: Departament d'Innovació, Universitats i Empresa, Generalitat de Catalunya: grant number: 2021SGR623; ICREA Academia prize 2024 to M.S.; Infrastruktura PL-Grid: grant number: PLG/2024/017801; Ministerio de Ciencia, Innovación y Universidades: grant number: PID2023-147424NB-I00 and Narodowe Centrum Nauki: grant number: 2021/42/E/ST4/00332 Aromaticitat (Química) Aromaticity (Chemistry) Quàntums, Teoria dels Quantum theory Molecular aromaticity: a quantum phenomenon