2',4'-Dihydroxy-5-bromochalcone Oxime as a Spectrophotometric Reagent for Cobalt(II) and Manganese(II)

Abstract

2',4'-Dihydroxy-5'-bromochalcone oxime (DHBCO) has been synthesized and used as a new spectrophotometric reagent for Co(II) and Mn(II). In pH range 8.0–10.0, this reagent gives dark violet coloured complexes with Co(II) and Mn(II). Job's and mole-ratio methods revealed that the stoichiometry of both the complexes is 1 : 1. Both the complexes obey the Beer's law over a wide range of concentration. The molar absorptivities and Sandell's sensitivities have been calculated. The stability constants at 27°C and Gibb's free energy changes have also been calculated. Applicability has been checked by using the reagents to determine manganese in ore samples.