Spectrophotometric Determination of Cu(II) using 2-Hydroxy-4N-butoxy-5-bromo Acetophenone Oxime

Abstract

2-Hydroxy-4N-butoxy-5-bromo acetophenone oxime (HBBAO) has been used for the spectrophotometric determination for Cu(II) at pH 4-6 in chloroform medium. Job's method for continuous variation, Yoe and Jones' mole ratio method, the slope ratio method show metal:ligand ratio in complex to be 1:2. The stability constant of the complex is found to be 6.63 × 10⁸. The standard free energy change for the complex formation reaction is found to be -12.24 kcal/mol at room temperature. The Beer's law obeyed in the concentration range 31.77 to 254.16 ppm for Cu(II) ion, while the optimum concentration range from Ringbom plot is found to be 95.31 to 254.16 ppm. The sandell's sensitivity and molar absorptivity at the 650 nm are found to be 0.47 μg/cm² and 134 L mol^-1 cm^-1, respectively. The complex is stable for 48 h. The reagent has also been found to give quite satisfactory results for Cu(II) present in alloy like brass, bronze and synthetic mixtures.