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

Zhang, Xing; Shen, Ling Yi; Zhang, Qi Long; Yang, Xian Jiong; Huang, Ya Li; Redshaw, Carl; Xu, Hong

Abstract

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 Ka = 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.

Citation

Zhang, X., Shen, L. Y., Zhang, Q. L., Yang, X. J., Huang, Y. L., Redshaw, C., & Xu, H. (2021). A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis. Molecules, 26(5), Article 1233. https://doi.org/10.3390/molecules26051233

• Journal Article Type: Article
• Acceptance Date: Feb 20, 2021
• Online Publication Date: Feb 25, 2021
• Publication Date: Mar 1, 2021
• Deposit Date: Feb 26, 2021
• Publicly Available Date: Feb 26, 2021
• Journal: Molecules (Basel, Switzerland)
• Electronic ISSN: 1420-3049
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 5
• Article Number: 1233
• DOI: https://doi.org/10.3390/molecules26051233
• Keywords: Organic Chemistry
• Public URL: https://hull-repository.worktribe.com/output/3729323