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Article Dans Une Revue Angewandte Chemie International Edition Année : 2022

Simultaneous Detection of Circularly Polarized Luminescence and Raman Optical Activity in an Organic Molecular Lemniscate

Résumé

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 pi-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.
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Dates et versions

hal-03772724 , version 1 (17-02-2023)

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Luis Palomo, Ludovic Favereau, Kabali Senthilkumar, Marcin Stepien, Juan Casado, et al.. Simultaneous Detection of Circularly Polarized Luminescence and Raman Optical Activity in an Organic Molecular Lemniscate. Angewandte Chemie International Edition, 2022, 61 (34), pp.-e202206976. ⟨10.1002/anie.202206976⟩. ⟨hal-03772724⟩
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