Li Yun-Lan, Wang Hai-Ling, Zhu Zhong-Hong, Wang Yu-Feng, Liang Fu-Pei, Zou Hua-Hong
School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004, P. R. China.
Nat Commun. 2024 Apr 4;15(1):2896. doi: 10.1038/s41467-024-47246-z.
The synthesis of dynamic chiral lanthanide complex emitters has always been difficult. Herein, we report three pairs of dynamic chiral Eu 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 complexes have almost no obvious emission, while in the aggregate state, they greatly enhance the Eu 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 (D → F) and 2429 Mcm of R-Eu-Et-1, achieving a rare double improvement. R-Eu-Et-1/2 exhibit excellent sensing properties for low concentrations of Cu ions, and their detection limits are as low as 2.55 and 4.44 nM, respectively. Dynamic Eu 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.
动态手性镧系配合物发光体的合成一直颇具难度。在此，我们报道了三对具有聚集诱导发光特性的动态手性铕配合物发光体（R/S-Eu-R-1，R = 乙基/甲基；R/S-Eu-Et-2）。在分子状态下，这些铕配合物几乎没有明显的发光现象，而在聚集状态下，它们通过限制分子内旋转和分子内振动极大地增强了铕的发光。不对称因子和圆偏振发光亮度分别高达0.64（D→F）和2429 Mcm（R-Eu-Et-1），实现了罕见的双重提升。R-Eu-Et-1/2对低浓度铜离子表现出优异的传感性能，其检测限分别低至2.55和4.44 nM。通过使用具有转子结构或振动单元的手性配体构建动态铕配合物，这一方法为动态手性发光材料的构建打开了一扇大门。
