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Autori: Marius Bumbac, Bogdan Serban, Constantin Luca, Gheorghe Nechifor, St. Voicu
Editorial: SYSCOM, Revista de Chimie, 57(9), p.927-930, 2006.
Extraction behaviour of two type of alkaline metals (Na +, K+) cations from aqueous phase to an organic phase ( methylene chloride and 1,2 dichloroethane ) was investigated with five types of extractants: p-tertbutylcalixarene, aminobenzo-15- crown –5, aminobenzo-18 -crown- 6 and a mixture of p-tertbutylcalixarene with each crown ethers mentioned above . All macrocyclic ligands show a moderate affinity for sodium and potassium cations. The effect of varying the pH of aqueous phase was examined. It was found that the tandems calixarene – crown ethers present synergistic effect in the extraction of alkali ions, the yield of extraction being increased. It was suggested that π- π stacking effect between the aromatic nuclei of the two extractants accounts for the increase in extraction yield.
Cuvinte cheie: p-tert-butilcalixarene, eteri coroana, extractie lichid-lichid, efect sinergic // p-tertbutylcalixarene, crown ethers, liquid –liquid extraction, synergistic effect, π-π stacking interactions.