Capturing of the copper(II) ions by several 4-aminoantipyrine Schiff bases: Synthesis, spectroscopic analysis, and decompsition of the resulted complexes into copper(II) oxide

Abstract

Here we describe the synthesis and characterization of three Schiff bases based on 4-aminoantipyrine, ligand A, ligand B, and ligand C. Ligand A was synthesized by reacting 4-aminoantipyrine with hydrazine, ligand B by reacting 4-aminoantipyrine with ethylenediamine, and ligand C by reacting 4-aminoantipyrine with benzaldehyde and hydrazine. The synthesis of the desired Schiff base derivatives was successfully achieved, as confirmed by elemental analysis, Fourier-transform infrared (FT-IR) spectroscopy, and nuclear magnetic resonance (1H and 13C NMR) spectroscopy. The obtained experimental results exhibited excellent agreement with previously published data. To evaluate the reactivity of the synthesized Schiff bases in forming stable metal complexes, their reaction with copper(II) ions was examined. The results indicated that ligand A and ligand B effectively utilized the four nitrogen atoms (NNNN) from the 4-aminoantipyrine-N and azomethine-N groups to coordinate with copper(II) ions, while ligand C coordinated with the copper(II) ions using its four azomethine nitrogen atoms. Furthermore, the manufactured copper(II) complexes were subjected to thermal treatment in the air at 600 °C for 3 h, resulting in the successful generation of copper(II) oxide. Scanning electron microscopy-energy-dispersive X-ray analysis data demonstrated that the produced copper(II) oxide exhibited high purity and possessed a uniform and well-structured morphology. KEY WORDS: Schiff bases, 4-Aminoantipyrine, Copper(II) ion, Thermal decomposition, SEM/EDX, Morphology Bull. Chem. Soc. Ethiop. 2024, 38(2), 431-443.                                                                DOI: https://dx.doi.org/10.4314/bcse.v38i2.11