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dc.contributor.authorSilvester, Debbie
dc.contributor.authorGrygolowicz-Pawlak, Ewa
dc.contributor.authorBakker, Eric
dc.date.accessioned2017-01-30T15:10:42Z
dc.date.available2017-01-30T15:10:42Z
dc.date.created2010-03-15T20:02:31Z
dc.date.issued2010
dc.identifier.citationSilvester, 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.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/43875
dc.identifier.doi10.1016/j.elecom.2009.10.048
dc.description.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.

dc.publisherElsevier
dc.titleAssessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry
dc.typeJournal Article
dcterms.source.volume12
dcterms.source.startPage110
dcterms.source.endPage113
dcterms.source.issn13882481
dcterms.source.titleElectrochemistry Communications
curtin.note

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

curtin.departmentNanochemistry Research Institute (Research Institute)
curtin.accessStatusOpen access
curtin.facultyNanochemistry Research Institute (NRI)
curtin.facultyFaculty of Science and Engineering


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