Aggregation induced emission dynamic chiral europium(III) complexes with excellent circularly polarized luminescence and smart sensors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38575592.
- Also identified by DOI 10.1038/s41467-024-47246-z and PMC identifier 10994944.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The synthesis of dynamic chiral lanthanide complex emitters has always been difficult. Herein, we report three pairs of dynamic chiral Eu<sup>III</sup> 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<sup>III</sup> complexes have almost no obvious emission, while in the aggregate state, they greatly enhance the Eu<sup>III</sup> 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 (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub>) and 2429 M<sup>-1</sup>cm<sup>-1</sup> of R-Eu-Et-1, achieving a rare double improvement. R-Eu-Et-1/2 exhibit excellent sensing properties for low concentrations of Cu<sup>II</sup> ions, and their detection limits are as low as 2.55 and 4.44 nM, respectively. Dynamic Eu<sup>III</sup> 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.