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INFLUENCE OF THE TEMPERATURE ON THE SOLVENT EXTRACTION OF SOME LANTHANIDE PICRATES BY A POSPHORYLATED CALIX[4]ARENE
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 havi...
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Published in: | Phosphorus, sulfur, and silicon and the related elements sulfur, and silicon and the related elements, 2001-01, Vol.174 (1), p.93-100 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | 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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ISSN: | 1042-6507 1563-5325 |
DOI: | 10.1080/10426500108040235 |