Metal-ion recognition. Competitive bulk membrane transport of transition and post transition metal ions using oxygen-nitrogen donor macrocycles as ionophores

Citation
J. Kim et al., Metal-ion recognition. Competitive bulk membrane transport of transition and post transition metal ions using oxygen-nitrogen donor macrocycles as ionophores, J CHEM S DA, (19), 2000, pp. 3453-3459
Citations number
67
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
ISSN journal
1470479X → ACNP
Issue
19
Year of publication
2000
Pages
3453 - 3459
Database
ISI
SICI code
1470-479X(2000):19<3453:MRCBMT>2.0.ZU;2-G
Abstract
A series of competitive metal ion transport experiments have been performed . Each involved transport from an aqueous source phase across a chloroform membrane phase into an aqueous receiving phase. The source phase contained equimolar concentrations of cobalt(II), nickel(II), copper(II), zinc(II), c admium(II), silver(I) and lead(II) while the membrane phase incorporated an ionophore chosen from a series of single-ring and double-ring macrocyclic ligands (incorporating mixed oxygen-nitrogen donor sets) together with hexa decanoic acid. The transport process was 'driven' by a back flux of protons , maintained by buffering the source and receiving phases at pH 4.9 and 3.0 , respectively. Transport selectivity for copper(II) was observed in all ca ses. The results confirm that consideration of the mass balance of the meta l ions present across all three transport phases is important for a fuller understanding of the nature of the discrimination process for the present s ystems.