A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis

Molecules

Carl Redshaw¹  Ya-Li Huang²  Xian-Jiong Yang²  Ling-Yi Shen²  Hong Xu³  Xing Zhang³  Qi-Long Zhang³ 

[1] Department of Chemistry, University of Hull, Cottingham Road, Hull, Yorkshire HU6 7RX, UK;School of Basic Medical Science, Guizhou Medical University, Guiyang 550004, China;The key Laboratory of Environmental Pollution Monitoring and Disease Control, School of Public Health, Ministry of Education, Guizhou Medical University, Guiyang 550004, China;

关键词: synthesis;    fluorescent probe;    copper(II) ion;    AIEE;    water detection;   

DOI  :  10.3390/molecules26051233

来源: DOAJ

【 摘 要 】

An aniline-functionalized naphthalene dialdehyde Schiff base fluorescent probe L with aggregation-induced enhanced emission (AIEE) characteristics was synthesized via a simple one-step condensation reaction and exhibited excellent sensitivity and selectivity towards copper(II) ions in aqueous media with a fluorescence “ turn-off ” phenomenon. The detection limit of the probe is 1.64 × 10⁻⁸ mol·L⁻¹. Furthermore, according to the results of the UV-vis/fluorescence titrations, Job’s plot method and ¹H-NMR titrations, a 1:2 stoichiometry was identified. The binding constant between L and Cu²⁺ was calculated to be K_a = 1.222 × 10³. In addition, the AIEE fluorescent probe L could be applied to detection in real water samples with satisfactory recoveries in the range 99.10–102.90% in lake water and 98.49–102.37% in tap water.

【 授权许可】

Unknown