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

Published in Chemical Communications. 2014, vol. 50, no. 84, p. 12659-12661
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.
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ZHAI, Jingying, XIE, Xiaojiang, BAKKER, Eric. Ionophore-based ion-exchange emulsions as novel class of complexometric titration reagents. In: Chemical Communications, 2014, vol. 50, n° 84, p. 12659-12661. doi: 10.1039/C4CC05754F https://archive-ouverte.unige.ch/unige:144148

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Deposited on : 2020-11-04

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