2,4-Dihydroxy-5-Bromovalerophenone Oxime as a Gravimetric Reagent for Pd(II) and Mb(II) and Spectrophotometric Study of Complexes

Abstract

2,4-Dihydroxy-5-bromovalerophenone oxime (DHBVO) was

developed as a new analytical reagent for the gravimetric estimation of

divalent palladium and manganese ions. In the pH range of 2.0 to 5.0, this

reagent gives a golden yellow coloured precipitate with Pd²⁺. Job's method

and mole ratio method revealed that the stoichiometry of the complex is

1 : 2. Beer's law is obeyed up to 63.78 ppm of Pd²⁺. The molar absorptivity

at 440 nm of complex was found to be 5.01 x 10² L mol^–1 cm^–1 . The

stability constant of the complex is found to be 2.45 x 10⁹. Mn²⁺ gives

dark green coloured precipitate in pH range 8.5 to 9.0. Using both the

above-mentioned methods, it was found that stoichiometry was 1 : 1. The

molar absorptivity at 420 nm was found to be 3.9 X 10³ L mol^–1 em^–1.

The stability constant of the complex is found to be 1.61 x 10⁶. Beer's law

is obeyed up to 6.60 ppm of Mn²⁺. The reagent can be used for the analysis

of pyrolusite ore.