Abstract
The solvent extraction properties towards Ag+ of5,11,17,23-tetra-tert-butyl-25,27-diX-26,28-bis(diphenylphosphinoylmethoxy)calix[4]arenes (X = CH2C(O)NEt2 (1), CH2P(O)Ph2 (2), CH3 (3), CH2C(O)Et (4))have been studied. Each ligand forms a 1 : 1 complex with silver(I). Ligand1, which bears two amide functionalities, is the most efficacious,emphasizing the crucial role played by the polar amide groups. The rate oftransport of AgNO3 through a bulk liquid membrane with this ligand ascarrier was shown to be superior to that of DC18C6, a structurally-relatedmulti-oxygen donor carrier. NMR and IR data suggest that Ag+ is coordinatedto each of the oxygen atoms in the ligand leading to an encapsulatedstructure [Ag ⊂ 1]+.
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YAFTIAN, M., Burgard, M., Bachiri, A.E. et al. Calix[4]arenes with Pendant Amide and Phosphine Oxide Functionalities: Use as Extractive Agents and Carriers for Silver (I) Ions. Journal of Inclusion Phenomena 29, 137–151 (1997). https://doi.org/10.1023/A:1007980931959
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DOI: https://doi.org/10.1023/A:1007980931959