Abstract
The extraction of four lanthanide (La, Pr, Nd and Eu) picrates from water into 1,2-dichloroethane using 5,11,17,23 -tetra-tert/-butyl-25,26,27,28-tetrakis(diphenylphosphinoylmethoxy)calix[4]arene as extracting agent has been studied. The extraction process takes place via formation of a species having a 1:1:3 metal/ligand/picrate ratio. The investigation of the extraction as a function of temperature between 10-25°C reveals that the distribution ratio of metal ions decreases with increasing temperature. Thermodynamic parameters such as the free energy (δG°), enthalpy (δH°) and entropy (δS°) changes were evaluated from the distribution measurements. The extraction process in all cases is exothermic with positive entropy changes.
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