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Efficient catalytic reduction of 4-nitrophenol using copper(II) complexes with n,o-chelating schiff base ligands

Garba, Hassan Wafi and Abdullahi, Muhammad Sabiu and Jamil, Mohamad Shazwan Shah and Endot, Nor Azam (2021) Efficient catalytic reduction of 4-nitrophenol using copper(II) complexes with n,o-chelating schiff base ligands. Molecules, 26 (19). pp. 1-12. ISSN 1420-3049

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Official URL: http://dx.doi.org/10.3390/molecules26195876

Abstract

The reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride was used as a model to test the catalytic activity of copper(II) complexes containing N,O-chelating Schiff base ligands. In this study, a series of copper(II) complexes containing respective Schiff base ligands, N′-salicylidene-2-aminophenol (1), N′-salicylidene-2-aminothiazole (2), and N,N′-bis(salicylidene)-o-phenylenediamine (3), were synthesized and characterized by elemental analysis, Fourier transform infrared (FT-IR), and UV-Visible (UV-Vis) and electron paramagnetic resonance (EPR) spectroscopies. The results from the 4-nitrophenol reduction showed that 3 has the highest catalytic activities with 97.5% conversion, followed by 2 and 1 with 95.2% and 90.8% conversions, respectively. The optimiza-tion of the catalyst amount revealed that 1.0 mol% of the catalyst was the most optimized amount with the highest conversion compared to the other doses, 0.5 mol% and 1.5 mol%. Recyclability and reproducibility tests confirmed that all three complexes were active, efficient, and possess excellent reproducibility with consistent catalytic performances and could be used again without a major decrease in the catalytic activity.

Item Type:Article
Uncontrolled Keywords:copper complexes, reduction of 4-nitrophenol, schiff base
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:94472
Deposited By: Yanti Mohd Shah
Deposited On:31 Mar 2022 15:46
Last Modified:31 Mar 2022 15:46

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