Copper (II) Distributions Between Buffered Aqueous Phases and Organic Phases of 4, 4´-(1E,1E´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene) Bis (5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) (H2BuEtP) in Chloroform

Abstract: The distribution of Cu²⁺ between buffered aqueous phases and chloroform solutions of 4,4´-(1E,1E´)-1,1´-(ethane-1,2-diylbis(azan-1-yl1ylidene))bis(5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-ol) (H₂BuEtP) alone and in the presence of 1-(3-hydroxy-5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl) butan-1-one(HBuP) was investigated using solvent-solvent extraction. 200 mgL^-1 Cu²⁺ was used for the study with an equilibration time of 60 minutes. Concentration of Cu²⁺ in aqueous phases after equilibration was determined with AAS and calculated by difference between Copper concentration in the aqueous phases and the organic phases, and distribution ratios(D) and percentage extractions(%E) were determined. Slope analysis from plots of log D against buffers pHs, ligands concentrations and metal concentrations were used to propose distribution reaction equations and extracted Cu²⁺ complexes as Cu(HBuEtP.X)_(o) for ligand alone and Cu(HBuEtP.BuP)_(o) in the presence of HBuP. The extraction constant log K_ex, obtained for H₂BuEtP (-5.11±0.7) was greater than that for H₂BuEtP/HBuP (-12.94±1.26) which indicated HBuP did not exert any synergic effects in the distribution of Cu²⁺, even though partition coefficient log D for H₂BuEtP/HBuP of 2.03 ± 0.81 was > 0.97 ± 0.62 for H₂BuEtP. Comparing results with those of other studies, showed carbon chain length of structurally related ligands effects on metal ions distribution is dependent on the particular metal ion. The ligand H₂BuEtP was a better extractant for Cu²⁺ than Ni²⁺ and Fe²⁺ only as the results for Pb²⁺, UO²⁺ and Cd²⁺ were better based on log K_ex values.

Distribution, ligands, buffers, extraction constant, partition coefficient

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