2-Hydroxy-4-Methoxybenzophenone Oxime as an Analytical Reagent for Copper(II)

Abstract

2-Hydroxy-4-methoxybenzophenoneoxime (HMBO) was developed as a new analytical reagent for the gravimetric determination of Cu(II). In pH 2.5-9.0 the reagent gives brown coloured precipitate with Cu(II). Spectrophotometric methods revealed that the stoichiometry of the complex is 1:2 (metal: ligand). Beer's law is obeyed up to 31.75 ppm of Cu(II). Molar absorptivity and Sandell's sensitivity at 400 nm were found to be 7.0×10² L mol^-1 cm^-1 and 0.090 μg/cm² respectively. The stability constant of Cu(II)-HMBO complex is found to be 6.13×10⁹. Gibb’s free energy change for complex formation reaction was found to be -13.93 Kcal/mol. The reagent can be used for the analysis of brass.