Fabian Thiemann, Niamh O’neill, et al.
Journal of Physics Condensed Matter
Indenofluorenes are non-benzenoid conjugated hydrocarbons that have received great interest owing to their unusual electronic structure and potential applications in nonlinear optics and photovoltaics. Here we report the generation of unsubstituted indeno[1,2-a]fluorene on various surfaces by the cleavage of two C–H bonds in 7,12-dihydroindeno[1,2-a]fluorene through voltage pulses applied by the tip of a combined scanning tunnelling microscope and atomic force microscope. On bilayer NaCl on Au(111), indeno[1,2-a]fluorene is in the neutral charge state, but it exhibits charge bistability between neutral and anionic states on the lower-workfunction surfaces of bilayer NaCl on Ag(111) and Cu(111). In the neutral state, indeno[1,2-a]fluorene exhibits one of two ground states: an open-shell π-diradical state, predicted to be a triplet by density functional and multireference many-body perturbation theory calculations, or a closed-shell state with a para-quinodimethane moiety in the as-indacene core. We observe switching between open- and closed-shell states of a single molecule by changing its adsorption site on NaCl. (Figure presented.)
Fabian Thiemann, Niamh O’neill, et al.
Journal of Physics Condensed Matter
Fabian Paschke, Ricardo Ortiz, et al.
DPG Spring Meeting 2025
Alice Driessen, Susane Unger, et al.
ISMB 2023
Geisa Lima, Matheus Esteves Ferreira, et al.
Enbraer 2024