Synthesis, characterization and total phenolic content of Ni(ii) and Cr(iii) hydroxamic acids complexes / Suhainiza Bari

Four complexes of Hydroxamic acid ligands, 2-pyridinehydroxamic acid and salicylhydroxamic acid with metal Ni(II) and Cr(III) have been prepared in ratio 2:1 (hydroxamic acids : metal salt). New hydroxamic acid complexes bis(salicylhydroximato)Nickelate(II) derived from salicylhydroxamic acid and Ni(II) acetate and bis(2-pyridinehydroxamato)Nickel(II) derived from 2-pyridinehydroxamic acid and Ni(II) acetate using the same ratio were successfully synthesized. The hydroxamic acid metal complexes have been characterized by using elemental analysis, UV-Vis spectrophotometry, magnetic susceptibility and infrared spectroscopy. These complexes also have been tested to know their total phenolic content (TPC) or the antioxidant compound. The results show that the Ni(sha)2.MeOH complex have higher total phenolic content compared to Ni(pyha)2.MeOH.H2O complex.