International Journal of Science, Engineering and TechnologyAuthors: Garima, Ravi Kumar Rana, Niranjan Singh Rathee
Abstract: A Schiff base ligand, 2,2′- ((1E,1′E)- ((4-methyl-1,3-phenylene) bis(azanylylidene)) bis (methanylylidene) bis(4-bromophenol), was synthesized via a condensation reaction between 5-bromosalicylaldehyde and 4-methyl-1,3-phenylenediamine. The synthesized ligand was subsequently used to prepare Ni(II) and Cu(II) metal complexes. The stability constants and free energy changes associated with the chelation of the Schiff base ligand with Cu(II) and Ni(II) ions were determined using UV–visible absorbance measurements employing the mole ratio method. The results indicated that one mole of the Schiff base ligand coordinates with one mole of each metal ion, forming stable 1:1 metal–ligand chelates. These results obtained from calculation of Stability Constant and Free Energy Change during chelation demonstrates that the Cu(II) chelate is thermodynamically more stable than the Ni(II) chelate under the studied conditions.
DOI: https://doi.org/10.5281/zenodo.17961121
