Voltammetric and thermodynamic studies of the VOSO4.5H2O and N-3-phenylallylidene nicotinohydrazide complexation system

Document Type : Original Article

Authors

1 Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt

2 Chemistry Department, Faculty of Science, Mansoura University, Mansoura

Abstract

A multichannel potentiostat of the type DY2100 was used to conduct a comprehensive thermodynamic/kinetic study on the redox activity of the VO(II) cation in the absence and presence of the synthesized N-3-phenylallylidene nicotinohydrazide HNP ligand. The cyclic voltammetry experiment was operated at a glassy carbon electrode surface as a working electrode and at a room temperature of 305oK. NaClO4 sodium perchlorate solution with a concentration of 0.1 M was prepared to act as an electrolytic medium. Various kinetic/thermodynamic parameters were provided, which exhibited a linear increase with increasing VO(II) concentration. The reaction mechanism was suggested depending on Nicholson’s theory, whereas the VO(II) ion’s redox activity in the absence and presence of HNP underwent a reversible chemical reaction preceding a  reversible electron transfer mechanism. Furthermore, the thermodynamic characteristics expressed in Gipps free energy and the stability constant of the complexation process were assessed. After the end of the addition of the HNP, the Gipps free energy and the stability constant were estimated to be -19.5 kJ and 2264.13, respectively, and these findings revealed that the process occurred spontaneously

Keywords

Mansoura Journal of Chemistry
Volume 63, Issue 5
December 2023
Pages 34-41

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