Proton-ionizable crown compounds. 12. Proton-Coupled selective membrane transport of Li+ using a proton-ionizable pyridono macrocycle

Reed M. Izatt, Gypzy C. Lindh, Ronald L. Bruening, Peter Huszthy, John D. Lamb, Jerald S. Bradshaw, James J. Christensen

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The macrocycle-mediated fluxes of several alkali metal cations have been determined in a H2O-CH2Cl2-H2O liquid membrane system. Water-insoluble proton-ionizable macrocycles of the pyridono type were used. The proton-ionizable feature allows the coupling of cation transport to reverse H+ transport. This feature offers promise for the effective separation and/or concentration of alkali metal ions with the metal transport being driven by a pH gradient. A counter anion in the source phase is not co-transported. The desired separation of a particular metal ion involves its selective complexation with the macrocycle, subsequent extraction from the aqueous phase to the organic phase, and exchange for H+ at the organic phase-receiving phase interface. Factors affecting transport which were studied include ring size, source phase pH, and receiving phase pH. Lithium was transported at a rate higher than that of the other alkali metals in both single and competitive systems using a 15-crown-5 pyridono carrier.

Original languageEnglish
Pages (from-to)739-745
Number of pages7
JournalJournal of Inclusion Phenomena
Volume5
Issue number6
DOIs
Publication statusPublished - Dec 1 1987

Keywords

  • Pyridono macrocycles
  • coupled M-H transport
  • liquid membrane
  • proton-ionizable
  • selective alkali cation transport

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Condensed Matter Physics

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