Complexing Properties of Calix[4]arene Amide Derivatives

Author(s): Slim Manai, Lassaad Baklouti, Rym Abidi and Abdelwaheb Hamdi

: The complexing properties of some pyridine amide calix[4]arenes have been carried out in acetonitrile and monitored by UV spectrophotometry. Their considered targets were several heavy metals (Hg2+, Cd2+ and Pb2+) and trivalent lanthanides cations (La3+, Nd3+, Eu3+, Gd3+ and Yb3+). The three derivatives (1, 2 and 3) form mononuclear complexes with heavy metal and lanthanide cations, except in the case of calixarene 2, which formed simultaneously mononuclear and binuclear species with Pb2+. The results show that the complexation is the main factor affecting the extraction with the tetra-substituted ligands (1, 2), in contrast with the di-substituted ligand 3.


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