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Chemistry in Industry : Journal of Chemists and Chemical Engineers of Croatia, Vol. 70 No. 7-8, 2021.

Original scientific paper

https://doi.org/10.15255/KUI.2020.068

Electrochemical Oxidation of 2,5-Dimercapto-1,3,4-thiadiazole on Carbon Electrodes Modified with Ru(III) Schiff Base Complex

Mirha Pazalja orcid id orcid.org/0000-0001-6614-702X ; University of Sarajevo, Faculty of Pharmacy, Zmaja od Bosne 8, 71 000 Sarajevo, Bosnia and Herzegovina

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Abstract

The thiol compound 2,5-dimercapto-1,3,4-thiadiazole is a potential cathode material. The redox reactions of the mentioned thiol compound are slow at room temperature but can be enhanced using electron transfer mediators. The electrochemical oxidation of 2,5-dimercapto-1,3,4-thiadiazole on the surface of carbon electrodes modified with Ruthenium(III) Schiff base complex was studied by voltammetric methods and amperometric flow injection analysis. The electrocatalytic properties of Ruthenium(III) Schiff base complex on glassy carbon and screen printed carbon electrodes are enhanced by the addition of multi-walled carbon nanotubes and Nafion. Voltammetric studies showed that anodic oxidation of DMcT on a modified glassy carbon electrode occurs at a potential of +0.28 V vs. Ag/AgCl in Britton-Robinson buffer (pH 6.50). Flow injection amperometric measurements were performed at +0.20 V vs. Ag/AgCl in Britton-Robinson buffer solutions pH 6.50 at a 0.40 cm3 min–1 flow rate. The results of amperometric measurements for modified screen printed and glassy carbon electrodes showed that the screen printed electrode had a lower value of detection limit (0.38 mg dm–3) and quantification (1.28 mg dm–3), and a linear dynamic range from 1 to 500 mg dm–3 of 2,5-dimercapto-1,3,4-thiadiazole. Modified glassy carbon electrode provided a linear dynamic range up to 750 mg dm–3 of 2,5-dimercapto-1,3,4-thiadiazole with a detection limit of 3.90 mg dm–3 and quantification of 13.20 mg dm–3.

Keywords

2,5-dimercapto-1,3,4-thiadiazole; Ru(III) Schiff base complex; carbon electrodes; multi-walled carbon nanotubes; voltammetry and amperometric analysis

Hrčak ID:

259343

URI

https://hrcak.srce.hr/259343

Publication date:

24.6.2021.

Article data in other languages: croatian

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