Facilitated transport of salts by neutral anion carriers
| Autor: | Feike de Jong, David N. Reinhoudt, Lysander A. J. Chrisstoffels |
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| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: |
Facilitated diffusion
Chemistry Organic Chemistry Inorganic chemistry General Chemistry Uranyl Catalysis Anion recognition Ion Gibbs free energy Solvent Partition coefficient symbols.namesake chemistry.chemical_compound Membrane symbols Organic chemistry Molecular recognition Host–guest chemistry Supramolecular chemistry Host-guest chemistry Artificial receptors |
| Zdroj: | Chemistry : a European journal, 6(8), 1376-1385. Wiley-VCH Verlag |
| ISSN: | 0947-6539 |
| DOI: | 10.1002/(sici)1521-3765(20000417)6:8<1376::aid-chem1376>3.0.co;2-i |
| Popis: | Partitioning of ions from water to the membrane solvent (NPOE) can be quantified by Gibbs free energies of transfer, ΔGtr,NPOE(ion). These were derived from transport studies of lipophilic salts through supported liquid membranes (SLMs) in the absence of the carrier. Partition coefficients Kp for various salts can now be calculated. The neutral anion receptors uranyl sal(oph)enes 1-5 transport Cl- and H2PO as tetrapropylammonium salts. The transport is diffusion-limited and can be described by two transport parameters Dm and Kex. From the extraction constants Kex and the partition coefficients Kp of the transported salts, the association constants Ka of the anion receptors for Cl- and H2PO in NPOE were determined. Competitive transport with carriers 3 and 4 of NPr4H2PO4 and NPr4Cl demonstrated highly selective transport of H2PO even in the presence of excess of Cl-. |
| Databáze: | OpenAIRE |
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