Dynamic Coordination between a Triphenylamine-Functionalized Salicylaldehyde Schiff Base and a Copper(II) Ion

Zhang, Xing; Wu, Shou Ting; Yang, Xian Jiong; Shen, Ling Yi; Huang, Ya Li; Xu, Hong; Zhang, Qi Long; Sun, Tao; Redshaw, Carl; Feng, Xing

Abstract

The coordination between a ligand and a metal is a spontaneous and uncontrollable process. In this Article, we successfully observe the formation of metal coordination in a triphenylamine-functionalized salicylaldehyde Schiff base with a copper(II) ion. The ligand TPA-Py first reacts with Cu2+ in a stepwise process to afford the dynamic complex TPA-Py@Cu2+ ([ligand]:[Cu2+] = 1:1), which further reacts with an extra copper(II) ion to afford 2TPA-Py@4Cu2+ with the following stepwise (or cumulative) stability constants: K1 = 4.0694 × 103 and K2 = 1.0761 × 106, respectively. The entire metal coordination process can be visualized, and the coordination mode of the probe toward copper was further evaluated by ultraviolet-visible/fluorescence spectra, single-crystal X-ray diffraction, density functional theory calculations, high-resolution mass spectra, and nuclear magnetic resonance spectroscopic titrations. Compound TPA-Py exhibited excellent sensitivity and specificity toward copper(II) ions in THF/water media with a low limit of detection of 2.687 × 10-7 mol L-1. In addition, TPI-An-Py can be applied to the detection of Cu2+ in real samples with satisfactory recoveries in the range of 100-112% in lake water and 98-101% in tap water. This Article not only reports an excellent fluorescence probe for copper(II) ion detection but also presents an instance for more fully understanding the metal coordination process.

Citation

Zhang, X., Wu, S. T., Yang, X. J., Shen, L. Y., Huang, Y. L., Xu, H., …Feng, X. (2021). Dynamic Coordination between a Triphenylamine-Functionalized Salicylaldehyde Schiff Base and a Copper(II) Ion. Inorganic chemistry, https://doi.org/10.1021/acs.inorgchem.1c00523

• Journal Article Type: Article
• Acceptance Date: Jun 6, 2021
• Online Publication Date: Jun 7, 2021
• Publication Date: Jun 7, 2021
• Deposit Date: Jun 8, 2021
• Publicly Available Date: Jun 8, 2022
• Journal: Inorganic Chemistry
• Print ISSN: 0020-1669
• Electronic ISSN: 1520-510X
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1021/acs.inorgchem.1c00523
• Keywords: Physical and Theoretical Chemistry; Inorganic Chemistry
• Public URL: https://hull-repository.worktribe.com/output/3786778