Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
Dalton Trans. 2021 Feb 7;50(4):1507-1513. doi: 10.1039/d0dt04062b. Epub 2021 Jan 14.
A multi-binding site chemosensor, N-(3-methoxy-2-hydroxybenzylidene)-3-hydroxy-2-naphthahydrazone (HL), with excited-state intramolecular proton transfer (ESIPT) behaviour was prepared and characterized. It possesses no aggregation-induced emission (AIE) characteristics but can detect Cd and Zn ions selectively in the "off-on" mode based on the AIE of their complexes in the media of THF/HEPES and THF/HO, respectively, which will provide a new strategy for target detection based on AIE. The detection limits of Zn and Cd were 9.85 × 10 M and 1.27 × 10 M, respectively. The aggregates of the complexes formed in the detection system were confirmed by DLS data and SEM images. The corresponding Zn (1) and Cd (2) complexes were prepared to investigate the response mechanism. Powder X-ray diffraction and single crystal X-ray diffraction proved that complex 1 is the species formed in the detection system. The chemosensor coordinates with the Cd and Zn ions in different formation and coordination modes, leading to the emission position of the aggregates at 560 and 645 nm, respectively, based on which Cd ions were successfully differentiated from Zn ions. Moreover, the detection of Cd and Zn ions was realized qualitatively via test paper and quantitatively in water.
一种具有激发态分子内质子转移（ESIPT）行为的多结合位点化学传感器，N-(3-甲氧基-2-羟基苯亚甲基)-3-羟基-2-萘腙（HL），被制备并进行了表征。它没有聚集诱导发光（AIE）特性，但可以在 THF/HEPES 和 THF/HO 介质中分别以其配合物的 AIE 为基础，以“关-开”模式选择性地检测 Cd 和 Zn 离子，这将为基于 AIE 的目标检测提供新策略。Zn 和 Cd 的检测限分别为 9.85×10 M 和 1.27×10 M。通过 DLS 数据和 SEM 图像证实了检测系统中形成的配合物的聚集物。制备相应的 Zn(1)和 Cd(2)配合物以研究响应机制。粉末 X 射线衍射和单晶 X 射线衍射证明 1 号配合物是检测系统中形成的物种。该化学传感器与 Cd 和 Zn 离子以不同的形成和配位方式配位，导致聚集物的发射位置分别在 560nm 和 645nm，基于此，成功地将 Cd 离子从 Zn 离子中区分出来。此外，通过试纸实现了对 Cd 和 Zn 离子的定性检测，并在水中实现了定量检测。
