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    Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry

    134119_134119.pdf (171.7Kb)
    Access Status
    Open access
    Authors
    Silvester, Debbie
    Grygolowicz-Pawlak, Ewa
    Bakker, Eric
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Silvester, Debbie and Grygolowicz-Pawlak, Ewa and Bakker, Eric. 2009. Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry. Electrochemistry Communications. 12 (1): pp. 110-113.
    Source Title
    Electrochemistry Communications
    DOI
    10.1016/j.elecom.2009.10.048
    ISSN
    13882481
    Faculty
    Nanochemistry Research Institute (NRI)
    Faculty of Science and Engineering
    School
    Nanochemistry Research Institute (Research Institute)
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/601449/description#description Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/43875
    Collection
    • Curtin Research Publications
    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 anionexchanger, 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 102 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 protocolsare not suitable.

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