Tripodal Ionophore with Sulfate Recognition Properties for Anion-Selective Electrodes

Ionophore topology has a profound effect on the behavior of ion-selective electrodes. This is demonstrated with a new class of ionophores that incorporates aminochromenone moieties linked through urea spacers to different scaffolds that preorganize the ionophore binding cleft into tripodal topologie...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2000-11, Vol.72 (21), p.5295-5299
Main Authors: Berrocal, Maria J, Cruz, Aurelio, Badr, Ibrahim H. A, Bachas, Leonidas G
Format: Article
Language:English
Subjects:
Anions - analysis
Chemistry
Electrodes
Ionophores - chemistry
Ions
Membranes
Molecular Structure
Potentiometry
Sulfates - analysis
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Summary:Ionophore topology has a profound effect on the behavior of ion-selective electrodes. This is demonstrated with a new class of ionophores that incorporates aminochromenone moieties linked through urea spacers to different scaffolds that preorganize the ionophore binding cleft into tripodal topologies. Tris(2-aminoethylamine) and cis-1,3,5-tris(aminomethyl)cyclohexane were employed as the scaffolds. The two differ in their rigidity and in the size of ionophore cavity that they create. The electrodes based on the ionophore that incorporates the tris(2-aminoethylamine) scaffold show anti-Hofmeister behavior with an improved selectivity for sulfate. In contrast, the ionophore with the cis-1,3,5-tris(aminomethyl)cyclohexane scaffold exhibits a more Hofmeister-like response.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac000241p