Aggregation induced emission dynamic chiral europium(III) complexes with excellent circularly polarized luminescence and smart sensors.

ABSTRACT: The synthesis of dynamic chiral lanthanide complex emitters has always been difficult. Herein, we report three pairs of dynamic chiral Eu^III complex emitters (R/S-Eu-R-1, R = Et/Me; R/S-Eu-Et-2) with aggregation-induced emission. In the molecular state, these Eu^III complexes have almost no obvious emission, while in the aggregate state, they greatly enhance the Eu^III emission through restriction of intramolecular rotation and restriction of intramolecular vibration. The asymmetry factor and the circularly polarized luminescence brightness are as high as 0.64 (⁵D₀ → ⁷F₁) and 2429 M^-1cm^-1 of R-Eu-Et-1, achieving a rare double improvement. R-Eu-Et-1/2 exhibit excellent sensing properties for low concentrations of Cu^II ions, and their detection limits are as low as 2.55 and 4.44 nM, respectively. Dynamic Eu^III complexes are constructed by using chiral ligands with rotor structures or vibration units, an approach that opens a door for the construction of dynamic chiral luminescent materials.

SUBMITTER: Li YL 

PROVIDER: S-EPMC10994944 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature