Fluoranthene-Containing Distorted Nanographenes Exhibiting TwoPhoton Absorption Response Bergner, John Páez, José Luis Maçôas, Ermelinda Álvaro-Martins, María Borstelmann, Jan Misselwitz, Erik Rominger, Frank Moreno Cruz, Carlos Kivala, Milan González Campaña, Araceli Two distorted nanographenes combining helicenes and a fluoranthene unit within their polycyclic scaffolds were synthesized. Their structural and electronic properties were elucidated by various spectroscopic methods, and the experimental data were corroborated computationally. The optical and electrochemical properties of the nanographenes were evaluated. The compounds exhibit an improved two-photon absorption crosssection compared to their seven-membered ring-containing counterparts reported previously by us. These results provide important insights into how the incorporation of a pentagonal ring affects two-photon absorption properties of nanographenes. Moreover, one of the nanographenes is chiral and was obtained enantiomerically pure after chiral separation, allowing the study of its chiroptical properties both in absorption (electronic circular dichroism) and emission (circularly polarized luminescence). 2025-09-22T08:46:36Z 2025-09-22T08:46:36Z 2025-09-01 journal article Bergner, J., Páez, J. L., Maçôas, E., Álvaro-Martins, M., Borstelmann, J., Misselwitz, E., Rominger, F., Cruz, C. M., Kivala, M., & Campaña, A. G. (2025). Fluoranthene-containing distorted nanographenes exhibiting two-photon absorption response. Organic Letters, 27(36), 9933–9938. https://doi.org/10.1021/acs.orglett.5c02904 https://hdl.handle.net/10481/106517 10.1021/acs.orglett.5c02904 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Chemical Society