On-Surface Synthesis and Determination of the Open-Shell Singlet Ground State of Tridecacene

30 June 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The character of the electronic structure of acenes has been the subject of the longstanding discussion. However, convincing experimental evidence of their open-shell character has so far been missing. Here, we present on surface synthesis of tridecacene molecule by thermal annealing of octahydrotridecacene on Au(111) surface. We characterized the electronic structure of the tridecacene by scanning probe microscopy, which reveals presence of the inelastic signal at 126 meV. We attribute the inelastic signal to the spin excitation from the singlet biradical ground state to triplet excited state. To rationalize the experimental findings we carried out many-body ab-initio calculations as well as model Hamiltonian to take into account the effect of metallic substrate. Moreover, we provide a detailed analysis how the dynamical electron correlation and virtual charge fluctuation between molecule and metallic surface reduces the singlet-triplet band gap. Therefore, this work provides first experimental confirmation of the magnetic character of tridecacene.


higher acenes
scanning tunneling microscopy/spectroscopy
open shell
many-body ab-initio calculations
biradical ground state
on-surface synthesis

Supplementary materials

Supplementary material
precursor synthesis, additional STM data, theoretical approach description


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