Synthesis and spectral characterization of bis (salicylidene)-1, 2-diaminopropane Schiff base ligand and investigation of their copper(II) extraction capability from aqueous medium

In the present study, a polydentate Schiff base bis (salicylidene)-1,2-diaminopropane (H₂L) was synthesized and characterized by elemental analysis, FTIR spectroscopy, ¹H-NMR, and ¹³C-NMR spectroscopy. Then, the synthesized Schiff base has been used as a new extracting agent for copper (II) ions from aqueous to the organic phase. The effects of process parameters such as contact time, pH of aqueous phase, and bis (salicylidene)-1,2-diaminopropane concentration were investigated. Percentage extraction (%E) and distribution coefficient (D′) were calculated to determine the extracting capability of the bis (salicylidene)-1,2-diaminopropane upon copper ions Cu⁺². The optimum conditions of copper extraction have been established. The stoichiometry of the extracted species was ascertained by the graphical method of slope analysis; their equilibrium constant is also calculated at constant temperature (T = 293.2 K).