Symmetric and Asymmetric Copper Selective Electrodes based on N-(benzothiazol-2-ylcarbamothioyl)benzamide

Nasri Fateh, Abbas; Hajiaghababaei, Leila; Allahgholi Ghasri, Mohammad Reza; Shahvelayati, Ashraf Sadat; Kalateh, Khadijeh

doi:10.22034/abec.2024.712921

Symmetric and Asymmetric Copper Selective Electrodes based on N-(benzothiazol-2-ylcarbamothioyl)benzamide

Document Type : Original Article

Authors

Abbas Nasri Fateh

leila Hajiaghababaei

Mohammad Reza Allahgholi Ghasri

Ashraf Sadat Shahvelayati

Khadijeh Kalateh

Department of Chemistry, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran

10.22034/abec.2024.712921

Abstract

The present work aimed at comparing the capabilities and efficiency of symmetric and asymmetric electrodes for potentiometric detection of Cu²⁺. Initially, we synthesized N-(benzothiazol-2-ylcarbamothioyl)benzamide, and ¹H-NMR, ¹³C-NMR, and FT-IR spectroscopy approaches were used for characterization. Subsequently, it was employed as an ionophore to fabricate asymmetric electrodes of coated wire (CWE) and solid-state (SSE) and symmetric electrodes with liquid internal electrolyte (LIE). The best liquid membrane was prepared with an Ionophore: DBP: PVC: NaTPB ratio of 12:56:30:2. All electrodes exhibited Nernstian responses. The detection limits for SSE (1×10^-9 mol/L) and CWE (1×10^-7 mol/L) were superior to LIE (2×10^-6 mol/L). Moreover, all three electrodes demonstrated very short response times (approximately 6 seconds) and exhibited large selectivity coefficient values for different cations. Asymmetric electrodes displayed longer lifetimes (SSE: 13 weeks and CWE: 12 weeks) compared to the symmetric electrode (LIE: 10 weeks). Finally, the electrodes were utilized for potentiometric titration of Cu²⁺ with ethylenediaminetetraacetic acid.

Keywords

Coated wire electrode

Cu2+

Liquid membrane

N-(benzothiazol-2-ylcarbamothioyl)benzamide

Potentiometry

Solid-state electrode

Subjects