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Bright Long‐Lived Circularly Polarized Luminescence in Chiral Chromium(III) Complexes
Author(s) -
Jiménez JuanRamón,
Poncet Maxime,
MíguezLago Sandra,
Grass Stéphane,
Lacour Jérôme,
Besnard Céline,
Cuerva Juan M.,
Campaña Araceli G.,
Piguet Claude
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202101158
Subject(s) - luminescence , chromophore , enantiomer , chemistry , pyridine , quantum yield , metal , aqueous solution , circular dichroism , chirality (physics) , circular polarization , photochemistry , materials science , fluorescence , crystallography , stereochemistry , organic chemistry , optoelectronics , physics , optics , nambu–jona lasinio model , chiral symmetry breaking , quantum mechanics , quark , microstrip
A series of highly emissive inert and chiral Cr III complexes displaying dual circularly polarized luminescence (CPL) within the NIR region have been prepared and characterized. The helical [Cr(dqpR) 2 ] 3+ (dqp=2,6‐di(quinolin‐8‐yl)pyridine; R=OCH 3 , Br or C≡CH) complexes were synthesized as racemic mixtures and resolved into their respective PP and MM enantiomers by chiral stationary phase HPLC. The corresponding enantiomers show large g lum ≈0.2 and high quantum yield of up to 17 %, which afford important CPL brightness of up to 170 m −1 cm −1 , a key point for applications as chiral luminescent probes. Moreover, the long‐lived CP‐NIR emission provided by these chromophores (ms range) in aqueous solution opens the way toward the quantification of chiral targets in biological systems with time‐gated detection. Thus, such chiral chromophores based on earth abundant and inert 3d metals open new perspectives in the field of CPL and represent an alternative to precious 4d, 5d and to labile 4f metal‐based complexes.