Smartphone-assisted chemosensor based on thiocarbohydrazide Schiff base for selective detection of Hg<SUP>2+</SUP> and Cu<SUP>2+</SUP> ions

Gumrah O., Gucoglu M., Satiroglu N.

JOURNAL OF MOLECULAR STRUCTURE, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2024
  • Doi Number: 10.1016/j.molstruc.2024.138859
  • Journal Name: JOURNAL OF MOLECULAR STRUCTURE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, Compendex, INSPEC
  • Hacettepe University Affiliated: Yes

Abstract

A simple and sensitive thiocarbohydrazide Schiff base colorimetric chemosensor (L) was synthesized, and characterized by FTIR, 1H NMR, TOF-MS, and elemental analyses. UV-vis absorption spectra of L in CH3CN:H2O (9:1, v/v) showed a highly selective absorption enhancement response towards Hg2+ and Cu2+ ions, accompanied by distinct color changes from colorless to yellow. The binding stoichiometry of chemosensor L and related metal ions was 2:1 and the binding constant was 2.6 x 10(5) M- 1 for Hg2+ and 2.6 x 10(4) M- 1 for Cu2+. The detection limits for Hg2+ and Cu2+ ions were 0.11 and 0.18 mu M, respectively. The effective naked eye color change of L depending on Hg(2+ )and Cu2+ concentration was integrated with smartphone for real-time applications of chemosensor. Finally, L was successfully applied to determine of Hg2+ and Cu2+ ions in tap water, drinking water, and river water samples.