Multifunctional Helicene‐Based Ytterbium Coordination Polymer Displaying Circularly Polarized Luminescence, Slow Magnetic Relaxation and Room Temperature Magneto‐Chiral Dichroism

The combination of physical properties sensitive to molecular chirality in a single system allows the observation of fascinating phenomena such as magneto‐chiral dichroism (MChD) and circularly polarized luminescence (CPL) having potential applications for optical data readout and display technology...

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Published in:Angewandte Chemie International Edition 2023-01, Vol.62 (5), p.e202215558-n/a
Main Authors: Dhbaibi, Kais, Grasser, Maxime, Douib, Haiet, Dorcet, Vincent, Cador, Olivier, Vanthuyne, Nicolas, Riobé, François, Maury, Olivier, Guy, Stéphan, Bensalah‐Ledoux, Amina, Baguenard, Bruno, Rikken, Geert L. J. A., Train, Cyrille, Le Guennic, Boris, Atzori, Matteo, Pointillart, Fabrice, Crassous, Jeanne
Format: Article
Language:English
Subjects:
Anisotropy
Chemical Sciences
Chirality
Chromophores
Circular polarization
Circularly Polarized Luminescence
Computer applications
Coordination polymers
Dichroism
Display devices
Helicene
Luminescence
Magnetic anisotropy
Magnetic induction
Magnetic properties
Magnetic relaxation
Magnetochiral Effect
Physical properties
Polymers
Room temperature
Single-Molecule Magnet
Ytterbium
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Summary:The combination of physical properties sensitive to molecular chirality in a single system allows the observation of fascinating phenomena such as magneto‐chiral dichroism (MChD) and circularly polarized luminescence (CPL) having potential applications for optical data readout and display technology. Homochiral monodimensional coordination polymers of YbIII were designed from a 2,15‐bis‐ethynyl‐hexahelicenic scaffold decorated with two terminal 4‐pyridyl units. Thanks to the coordination of the chiral organic chromophore to Yb(hfac)3 units (hfac−=1,1,1,5,5,5‐hexafluoroacetylaconate), efficient NIR‐CPL activity is observed. Moreover, the specific crystal field around the YbIII induces a strong magnetic anisotropy which leads to a single‐molecule magnet (SMM) behaviour and a remarkable room temperature MChD. The MChD‐structural correlation is supported by computational investigations. Enantiopure 1D YbIII coordination polymers involving helicene‐based ligands were designed. Their physical investigations revealed an unprecedented combination of field‐induced Single‐Molecule Magnet behavior, Near‐Infrared Circularly Polarized Luminescence and room temperature Magneto‐Chiral Dichroism (MChD). The magnetic anisotropy was determined as the preponderant criterion for the observation of a strong MChD.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202215558