RT Journal Article
T1 Simultaneous Detection of Circularly Polarized Luminescence and Raman Optical Activity in an Organic Molecular Lemniscate
A1 Palomo Gil, Luis
A1 Favereau, Ludovic
A1 Senthilkumar, Kabali
A1 Stępień, Marcin
A1 Casado-Cordón, Juan
A1 Ramírez-Aguilar, Francisco Javier
K1 Luz -- Dispersión
AB 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.
PB Wiley
YR 2022
FD 2022-07-03
LK https://hdl.handle.net/10630/24807
UL https://hdl.handle.net/10630/24807
LA eng
NO 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
NO We thank MINECO/FEDER of the Spanish Government (project reference PGC2018-098533-B-100 and PID2021-127127NB-I00) and the Junta de Andalucía, Spain (UMA18FEDERJA057). We also thank the vibrational spectroscopy unit of the Research Central Services (SCAI) of the University of Málaga. Financial support from the National Science Center of Poland (DEC-2015/19/B/ST5/00612, M.S.) is gratefully acknowledged. L.F. thanks Thomas Vives from the Ecole Nationale Supérieure de Chimie of Rennes, the Shimadzu and Chiral Technology companies for their support regarding the separation of the chiral molecule by supercritical fluid chromatography (SFC). Funding for open access charge: Universidad de Málaga/CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026