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Issue 84, 2014
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Ionophore-based ion-exchange emulsions as novel class of complexometric titration reagents

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Abstract

Complexometric titrations rely on a drastic change of the pM value at the equivalence point with a water soluble chelator forming typically 1 : 1 complexes of high stability. The available chemical toolbox of suitable chelating compounds is unfortunately limited because many promising complexing agents are not water soluble. We introduce here a novel class of complexometric titration reagents, a suspension of polymeric nanospheres whose hydrophobic core is doped with lipophilic ion-exchanger and a selective complexing agent (ionophore). The emulsified nanospheres behave on the basis of heterogeneous ion exchange equilibria where the initial counter ion of the ion-exchanger is readily displaced from the emulsion for the target ion that forms a stable complex in the nanosphere core. Two different examples are shown with Ca2+ and Pb2+ as target ions. The lack of protonatable groups on the calcium receptor allows one to perform Ca2+ titration without pH control.

Graphical abstract: Ionophore-based ion-exchange emulsions as novel class of complexometric titration reagents

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Supplementary files

Article information


Submitted
24 Jul 2014
Accepted
03 Sep 2014
First published
03 Sep 2014

Chem. Commun., 2014,50, 12659-12661
Article type
Communication
Author version available

Ionophore-based ion-exchange emulsions as novel class of complexometric titration reagents

J. Zhai, X. Xie and E. Bakker, Chem. Commun., 2014, 50, 12659
DOI: 10.1039/C4CC05754F

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