Liquid–liquid extraction of copper(II) with substituted salicylideneanilines from sulfate media

Abstract

The liquid–liquid extraction of copper(II) with Schiff bases in chloroform from sulfate media is studied for pH and concentration of the extractant. Stoichiometry coefficients of the extracted species are determined by the slope analysis method. With salicylideneaniline, the copper(II) is extracted as a mixed chelate complex, CuL₂HL. In the presence of substituent, the copper is extracted as simple chelates, CuL₂. The trends in the values of extraction constants were explained in terms of the nature of the substituents.

Keywords:

• Liquid–liquid extraction
• Copper(II)
• Schiff bases
• Substituent effect