Multifunctional Calix[4]arenes Containing Pendant Amide and Phosphoryl Groups: Their Use as Extracting Agents and Carriers for Alkali Cations |
| |
Authors: | M. R. Yaftian M. Burgard D. Matt C. Wieser C. Dieleman |
| |
Affiliation: | (1) Laboratoire de Chimie Minérale et Analytique, U.R.A. 405 du C.N.R.S., Ecole Européenne de Chimie, Polymères et Matériaux, Université Louis Pasteur, 1, rue Blaise Pascal, F-67008 Strasbourg Cedex, France |
| |
Abstract: | The complexing, extracting and mobile carrier properties of the tetra(phosphine oxide)-calix[4]arene 1 and the hybrid diamide-di(phosphine oxide)-calix[4]arene 2 were studied. Both ligands give 1 : 1 complexes with alkali cations in THF as shown by the picrate method. 1H NMR experiments were run to follow encapsulation of sodium and potassium cations. The corresponding spectra indicate C2-symmetrical structure. The observed extraction orders of the alkali picrates were as follows K+>Rb+>Li+>Cs+>Na+ for 1 and Li+>Na+>K+>Rb++ for 2. Transport kinetics was analysed by means of a model which assumes pure diffusion and which allows the evaluation of mass transfer coefficients in all systems. These coefficients and their influences on the transport rate are discussed in terms of size of the transporting species in the liquid membrane. |
| |
Keywords: | Alkali cations calixarene amide phosphine oxide complexation extraction transport |
本文献已被 SpringerLink 等数据库收录! |