A benzimidazole-appended double-armed salamo type fluorescence and colorimetric bifunctional sensor for identification of MnO4- and its applications in actual water samples

Pei-Lin Yuan; Li Tong; Xiao-Xia Li; Wen-Kui Dong; Yang Zhang

doi:10.1016/j.saa.2024.124252

A benzimidazole-appended double-armed salamo type fluorescence and colorimetric bifunctional sensor for identification of MnO₄^- and its applications in actual water samples

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jul 5:315:124252. doi: 10.1016/j.saa.2024.124252. Epub 2024 Apr 4.

Authors

Pei-Lin Yuan¹, Li Tong², Xiao-Xia Li², Wen-Kui Dong³, Yang Zhang⁴

Affiliations

¹ School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Gansu Provincial Biomass Function Composites Engineering Research Center, Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province, Gansu Province Research Center for Basic Sciences of Surface and Interface Chemistry, College of Chemical Engineering, Northwest Minzu University, Lanzhou, Gansu 730124, PR China.
² School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China.
³ School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. Electronic address: dongwk@126.com.
⁴ School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. Electronic address: zhangyang@mail.lzjtu.cn.

PMID: 38593541
DOI: 10.1016/j.saa.2024.124252

Abstract

The symmetrically double-armed salamo type fluorescent sensor BMS, incorporating benzimidazole units, was designed and synthesized. Showcasing remarkable specificity and responsiveness to MnO₄^- within a DMSO:H₂O (V/V = 9:1, pH = 7.2) Tris-HCl buffer medium, it enabled dual-channel detection of MnO₄^- through fluorescent and colorimetric changes. Critical experimental parameters, including detection and quantification thresholds (LOD and LOQ) along with binding affinity constants (K_a), were calculated using the Origin software. A rational interaction mechanism between BMS and MnO₄^- was deduced, based on fluorescence titration, Electrospray Ionization Mass Spectrometry (ESI-MS), Ultraviolet-Visible Spectroscopy (UV-Vis), Infrared Spectroscopy (IR), Stern-Volmer plots, and Density Functional Theory (DFT) computations. Additionally, the sensor BMS was applied to monitor MnO₄^- in real water samples. Advancing its practical utility, BMS was fabricated into test strips for the selective detecting of MnO₄^-.

Keywords: Benzimidazole moiety; Colorimetric recognition; Fluorescence recognition; Permanganate ion; Salamo type sensor.