Electron paramagnetic resonance and visible spectroscopic studies of mixed-ligand complexes of copper(II) ion, salicylate ion, and a nitrogen base in aqueous solution

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Abstract
The mixed-ligand complex formation of copper(II) ion with salicylate ion and a nitrogen base (ammonia, monoethanolamine, diethanolamine, or triethanolamine) has been studied in aqueous solution at 25 °C and 1.0 mol dm–3 ionic strength by means of e.p.r. spectroscopy. The reliability of the proposed e.p.r. method in the study of mixed-ligand systems is verified by comparison of the results obtained with those from visible spectroscopy and potentiometry.