2026-06-01T19:18:01Zhttps://riuma.uma.es/rest/oai/request

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

Simultaneous Detection of Circularly Polarized Luminescence and Raman Optical Activity in an Organic Molecular Lemniscate Palomo Gil, Luis Favereau, Ludovic Senthilkumar, Kabali Stępień, Marcin Casado-Cordón, Juan Ramírez-Aguilar, Francisco Javier Luz -- Dispersión 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. 2022-08-23T09:48:38Z 2022-08-23T09:48:38Z 2022-07-03 journal article 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 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Wiley