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Aggregation‐Dependent Circularly Polarized Luminescence and Thermally Activated Delayed Fluorescence from Chiral Carbene‐Cu(I)‐Amide Enantiomers

Von Wiley-VCH zur Verfügung gestellt

Luminescent carbene-metal-amide (CMA) complexes and chiroptical-active materials have been bursting into bloom in recent years, while chiroptical-active CMA complexes has not been reported so far. For the first time, a pair of chiral Cu(I)-based CMA enantiomers, (R,R)- PSIPr*-Cu-DMAC and (S,S) -PSIPr*-Cu-DMAC , were developed by using chiral phenyl-substituted N -heterocyclic carbenes as acceptor ligands in the CMA motif. The Cu(I)-based CMA enantiomers exhibited aggregation-induced circularly polarized luminescence with a large luminescence dissymmetry factor of up to +0.027, first reported in CMA complexes. This success originates from the limited ligand-ligand rotation freedom and asymmetrical packing pattern (helical structure) of CMA enantiomers in the crystals. Moreover, these Cu(I) enantiomers displayed inspiring aggregation-dependent thermally activated delayed fluorescence properties. These findings bring new insights into optical properties of chiral CMA complexes from perspective of aggregation states.

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