2026-05-29T22:27:40Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/248072026-02-03T10:55:06Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Palomo Gil, Luis author Favereau, Ludovic author Senthilkumar, Kabali author Stępień, Marcin author Casado-Cordón, Juan author Ramírez-Aguilar, Francisco Javier author 2022-07-03 Circularly polarized luminescence (CPL) and Raman optical activity (ROA) were observed in a single spectroscopic experiment for a purely organic molecule, an event that had so far been limited to lanthanide-based complexes. The present observation was achieved for [16]cycloparaphenylene lemniscate, a double macrocycle constrained by a rigid 9,9′-bicarbazole subunit, which introduces a chirality source and allows the molecule to be resolved into two configurationally stable enantiomers. Distortion of oligophenylene loops in this lemniscular structure produces a large magnetic transition dipole moment while maintaining the π-conjugation-induced enhancement of the Raman signal, causing the appearance of the CPL/ROA couple. A two-photon mechanism is proposed to explain the population of the lowest-energy excited electronic state prior to the simultaneous emission-scattering event. L. Palomo, L. Favereau, K. Senthilkumar, M. Stępień, J. Casado, F. J. Ramírez, Angew. Chem. Int. Ed. 2022, 61, e202206976; Angew. Chem. 2022, 134, e202206976 https://hdl.handle.net/10630/24807 https://doi.org/10.1002/anie.202206976 Luz -- Dispersión Simultaneous Detection of Circularly Polarized Luminescence and Raman Optical Activity in an Organic Molecular Lemniscate