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

• Published in: Molecules (Basel, Switzerland) Switzerland), 2021-02, Vol.26 (5), p.1233
• Main Authors: Zhang, Xing, Shen, Ling-Yi, Zhang, Qi-Long, Yang, Xian-Jiong, Huang, Ya-Li, Redshaw, Carl, Xu, Hong
• Format: Article
• Language: English
• Subjects: AIEE; Aniline; Aqueous solutions; Chromatography; Copper; Copper - analysis; Copper compounds; copper(II) ion; Crystallography, X-Ray; Drinking water; Experiments; Fluorescence; Fluorescent Dyes - chemical synthesis; Fluorescent Dyes - chemistry; Fluorescent indicators; fluorescent probe; Imines; Ions - analysis; Mass spectrometry; Metals; Models, Molecular; Molecular Structure; Naphthalene; Naphthalenes - chemical synthesis; Naphthalenes - chemistry; NMR; Nuclear magnetic resonance; Optical properties; Schiff Bases - chemical synthesis; Schiff Bases - chemistry; Scientific imaging; Selectivity; Solvents; Stoichiometry; synthesis; Water analysis; water detection; Water Pollutants, Chemical - analysis; Water sampling
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules26051233

An aniline-functionalized naphthalene dialdehyde Schiff base fluorescent probe 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 mol·L . Furthermore, according to the results of the UV-vis/fluorescence titrations, Job's plot method and H-NMR titrations, a 1:2 stoichiometry was identified. The binding constant between and Cu was calculated to be = 1.222 × 10 . In addition, the AIEE fluorescent probe 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.