Journal article
Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry
Electrochemistry Communications, Vol.12(1), pp.110-113
2010
Abstract
Many ionic salts synthesized using metathesis are often found to contain significant amounts of impurities, despite careful control of the weighing of starting materials. In this work, a potentiometric method is devised to monitor ion-exchange properties (or ‘purity’) of an organic solvent containing a lipophilic electrolyte. Its permselective behaviour is monitored by treating the solvent as a liquid membrane and contacting it with two aqueous solutions with different electrolyte activities. This electrolyte mismatch results in a drastic potential change when excess lipophilic cation-exchanger is titrated with anion-exchanger, altering the membrane from being cation to anion responsive. Here, the cation-exchanger potassium tetrakis(4-chlorophenyl)borate (KTpClPB) dissolved in nitrobenzene was titrated with tetradodecylammonium chloride (TDDACl), in contact with Ag/AgCl electrodes placed in aqueous 1 M and 10−2 M KCl, respectively. The predicted potential change of −214 mV was observed at the equivalence point, forming the inert lipophilic electrolyte ETH 500, in a very small concentration range of added anion-exchanger (0.8% for ±10 mV), suggesting good precision. The approach was confirmed by monitoring absorbance and fluorescence intensity changes of the chromoionophore Nile Blue. This method may be applied for the synthesis of a range of highly lipophilic salts for which established metathesis protocols are not suitable.
Details
- Title
- Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry
- Authors
- D S Silvester (Author) - Curtin University of TechnologyE Grygolowicz-Pawlak (Author) - University of Geneva, SwitzerlandEric Bakker (Author) - Curtin University of Technology
- Publication details
- Electrochemistry Communications, Vol.12(1), pp.110-113
- Publisher
- Elsevier Inc.
- DOI
- 10.1016/j.elecom.2009.10.048
- ISSN
- 1388-2481
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450034602621
- Output Type
- Journal article
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