A novel imidazole derived colorimetric and fluorometric chemosensor for bifunctional detection of copper (II) and sulphide ions in environmental water samples

Mater H Mahnashi; Ashraf M Mahmoud; Saad A Alkahtani; Ramadan Ali; Mohamed M El-Wekil

doi:10.1016/j.saa.2019.117846

A novel imidazole derived colorimetric and fluorometric chemosensor for bifunctional detection of copper (II) and sulphide ions in environmental water samples

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Mar 5:228:117846. doi: 10.1016/j.saa.2019.117846. Epub 2019 Nov 25.

Authors

Mater H Mahnashi¹, Ashraf M Mahmoud², Saad A Alkahtani³, Ramadan Ali⁴, Mohamed M El-Wekil⁵

Affiliations

¹ Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, Najran, Saudi Arabia.
² Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, Najran, Saudi Arabia; Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt.
³ Department of Clinical Pharmacy, College of Pharmacy, Najran University, Najran, Saudi Arabia.
⁴ Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Al-Azhar University, Assuit, Egypt.
⁵ Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt. Electronic address: mohamed.mohamoud@ymail.com.

PMID: 31791910
DOI: 10.1016/j.saa.2019.117846

Abstract

Herein, a novel "ON-OFF" colorimetric and fluorometric chemosensor; 1N-allyl-2-(2, 5-dimethoxyphenyl)-4, 5-diphenyl-1H-imidazole (ADPPI), was constructed for sequential determination of Cu²⁺ and S²^- ions in aqueous media. The interaction between chemosensor ADPPI and different metal cations was investigated using UV-VIS and fluorimetric spectroscopy. ADPPI showed a favorable and good interaction with Cu²⁺ ions producing blue colored solution peaked at 610 nm with blue fluorescence at λ_em. = 447 nm. The produced complex between Cu²⁺ ions and ADPPI can be used as a cascade probe for detection of S²^- ions. The detection limits (LODs) were 1.01 nM and 1.25 μM for Cu²⁺ and S²^- ions, respectively (the lowest between the family of colorimetric and fluorometric chemosensors). To further increase the applicability of the proposed method, Cu²⁺ and S²^- ions concentrations were measured in environmental water samples.

Keywords: Colorimetric chemosensor; Cu(2+) ions; Environmental water samples; Fluorometric chemosensor; S(2)(−) ions.