Preparation and identification of N-Phenyl benzohydroxamic acid complexes with four different metal ions Fe (III), Cr (III), Co (II) and Cu (II)

Abstract

One hydroxamic acid (N-Phenylbenzohydroxamic acid) was prepared and used as a ligand with four different metal ions, Chromium (III), Iron (III), Cobalt (II) and Copper (II).The hydroxamic acid was characterized by its molecular weight and melting point. The free ligand and complexes were studied spectroscopically using IR, UV/VIS techniques. In order to obtain the metal-ligand ratio, the Jobs continuous variation method was applied and it was found to be (1:3) for Chromium (III) and Iron (III), (1:2) for Cobalt (II) and Copper (II);using the Job method, the stability constants of these complexes were determined and were found to be as follows : Cr (III) - N-Phenyl benzohydroxamic acid = 8.858 x1010 > Fe (III) - N-Phenyl benzohydroxamic acid = 7.24 x1010 > Cu (II) - N-Pheny lbenzohydroxamic acid =6.4668x107 >Co (II) - N-Phenyl benzohydroxamic acid =5.5177x107.