Novel single-armed nitrogen-heterocyclic salamo-based fluorescent sensors for the detection of Al3+ and CN

Wen-Ze Zhang; Zhuang-Zhuang Chen; Xiu-Juan Han; Wen-Kui Dong

doi:10.1016/j.saa.2021.119815

Novel single-armed nitrogen-heterocyclic salamo-based fluorescent sensors for the detection of Al³⁺ and CN

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Sep 5:258:119815. doi: 10.1016/j.saa.2021.119815. Epub 2021 Apr 17.

Authors

Wen-Ze Zhang¹, Zhuang-Zhuang Chen¹, Xiu-Juan Han¹, Wen-Kui Dong²

Affiliations

¹ School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China.
² School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. Electronic address: dongwk@126.com.

PMID: 33930852
DOI: 10.1016/j.saa.2021.119815

Abstract

Two novel single-armed nitrogen-heterocyclic chemosensors with basically similar structures, PDNS and PZNS, were synthesized to specifically identify Al³⁺ in DMS:H₂O (1:1 v/v) solution by fluorescence emission spectroscopy, and the colour of PDNS and PZNS changed from yellow to colorless when Al³⁺ was added under daylight. This is the first time that nitrogen-heterocyclic is introduced into salamo-based chemical sensor. At excitation wavelengths of 361 and 365 nm, solutions of PDNS and PZNS changed to intense green-blue fluorescence. Furthermore, it was found that PDNS/PZNS and Al³⁺ have excellent binding capacity, the lower limit of detection (LOD = 6.25 × 10^-9/1.26 × 10^-9 mol·dm^-3) is also calculated. In addition, sensor PZNS can detect Al³⁺ in a solution system with up to 95% water content and applicable pH range is 3-12. Compared to other salamo-based sensors, PZNS and PDNS have broader detection conditions and wider utilities. PZNS can also identify CN^- in fluorescence spectrum. PZNS can be used for detection of Al³⁺ in aqueous systems in daily production and life.

Keywords: Cyanide; DFT calculation; Fluorescence recognition; Nitrogen-heterocyclic; Salamo-based probe.