Abstract
Abstract The protonation and complexation equilibria of the iron(III) and copper(II) complexes of N-hydroxy-3-pyridinecarboxamide (hpca) and N,2-dihydroxybenzamide (dhbc) have been investigated by potentiometric and spectrophotometric techniques in 0.5 mol dm−3 (KCl) at 25±0.1°C. It was shown that the properties of iron(III) and copper(II) chelates under study are similar to those of corresponding chelates of simple aromatic hydroxamic acids (without any additional donor groupings in the molecule). The hydroxamate and carbonyl oxygens may also take part in coordination in the copper(II) and iron(III) systems.
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