Cation transport at 25°c from binary Na+Mn+, Cs+Mn+ and Sr2+Mn+ nitrate mixtures in a H2OCHCl3H2O liquid membrane system containing a series of macrocyclic carriers |
| |
Authors: | JD Lamb PR Brown JJ Christensen JS Bradshaw DG Garrick RM Izatt |
| |
Institution: | Departments of Chemistry and Chemical Engineering and Contribution No. 264 from the Thermochemical Institute, Brigham Young University, Provo, UT 84602 U.S.A. |
| |
Abstract: | Cation fluxes from binary mixtures of either Na+, Cs+ or Sr2+ with other alkali metal cations, alkaline earth metal cations, and Pb2+ through a H2OCHCl3H2O bulk liquid membrane system containing one of several macrocyclic carriers have been determined Nitrate salts were used in all cases. The most selective transport of Na+ over all other cations studied was found with the carrier cryptand 2.2.1]. Selective transport of Na+ relative to Li+, Cs+ and the alkaline earth cations was found with cryptand 2.2.2B] and cryptand 2.2.2D]. The ligands 21-crown-7 and dibenzo-24-crown-8 showed selective transport of Cs+ over the second cation in all cases. Several macrocycles showed selectivity for Sr2+ over the second cation with the macrocycle 1,10-diaza-18-crown-6 showing the highest selectivity for this cation of all ligands studied. Relative fluxes from binary cation mixtures are rationalized in terms of macrocycle cavity size, donor atom type and ring substituents. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|