ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
NMR Studies of the Kinetic Limitation of Cation Selectivity of a Cadmium-Selective IonophoreThe Cd2+-selective ionophore N,N,N′,N′-tetrabutyl-3, 6-dioxaoctanedithioamide (1) looses its capability to induce cation selectivity in solvent polymeric membranes if these are contacted with Cu2+, Pd2+, Pt2+, Ag+ and Hg2+. For systems with a free energy of activation of the ligand exchange reaction of more than about 65 kJ mol-1 (in acetonitrile) the cation complexes of the ionophore act as anion exchangers (Pt2+, Pd2+). Below about 45 kJ mol-1 cation permselectivity is observed (Zn2+, Cd2+). Ag+ and Hg2+ induce a decomposition of the ionophore.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19830660721
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