2026-06-01T01:57:43Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/366542026-02-03T11:14:51Zcom_10630_2254col_10630_37953

Dibenzoquinone cyclopentadithiophene diradicaloids show optical transitions of different spin states and anomalous near-infrared emission Privado, María Moles Quintero, Sergio Barrejón, Myriam De-la-Cruz, Pilar Janaarthana Babu, P.M. Casanova, David Langa, Fernando Casado-Cordón, Juan Reactividad (Química) Radicales (Química) We have prepared a series of bis(semiquinone) compounds with dithiophene bridges of different length that evolve from closed-shell (smaller compound) to full diradical (longer compound) for which the narrow singlet-triplet energy gap allows the triplet population at 298 K. The medium size system has a variety of photonic properties with absorptions and emission in the optical near-infrared region mediated by a unique case of anti-Kasha emission. A whole set of optical absorption/emission and vibrational steady state spectroscopies as well as picosecond transient absorption spectroscopy, all complemented with spectroelectrochemistry and theoretical calculations, is presented. 2025-01-21T12:55:28Z 2025-01-21T12:55:28Z 2024 journal article M. Privado, S. Moles Quintero, M. Barrejón, P. de La Cruz, J. B. P. M., D. Casanova, F. Langa, J. Casado, Angew. Chem. Int. Ed. 2025, 64, e202413988. https://doi.org/10.1002/anie.202413988 https://hdl.handle.net/10630/36654 10.1002/anie.202413988 eng http://creativecommons.org/licenses/by-nc/4.0/ open access Atribución-NoComercial 4.0 Internacional Wiley