Abstract
Spectrophotometric technics based assay were developed for the determination of binding parameters like binding constant and binding free energy of two potential antioxidants ferrocene derivatives: 2-(ferrocenylmethylamino)benzonitrile (2FMAB), 3-(ferrocenylmethylamino) benzonitrile (3FMAB), and a standard ascorbic acid (AA) with 1,1-diphenyl-2- picrylhydrazyl radicals (DPPH). Obtained resultants indicated that the adduct 3FMBA-DPPH shows hig est binding constant and highest binding free energy (2.28×10-5 M -1 ) and (-30.59 KJmol -1 ) respectively. Binding free energy of 3FMAB-DPPH is almost twice greater than that of the adducts 2FMAB-DPPH (-14.47 KJmol -1 ) and also is greater than the adduct formed between the standard antioxidant ascorbic acid and 1,1-diphenyl-2-picrylhydrazyl radicals (AA-DPPH) (-19.29 KJmol -1 ). Key word : ferrocene derivatives, DPPH, binding parameters, binding free energy, binding constant.
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