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Ionophore extrem hoher Lipophilie als selektive Komponenten für Flüssigmembranelektroden
Author(s) -
Oesch Urs,
Ammann Daniel,
Pretsch Ernö,
Simon Wilhelm
Publication year - 1979
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19790620704
Subject(s) - lipophilicity , chemistry , ionophore , membrane , electromotive force , aqueous solution , ion selective electrode , phase (matter) , electrode , ion , aqueous two phase system , inorganic chemistry , stereochemistry , organic chemistry , selectivity , biochemistry , physics , quantum mechanics , catalysis
Selective ionophores of extreme lipophilicity for liquid membrane electrodes Lipophilic ionophores of the type diether diamides have been prepared. Their lipophilicity is up to 7 orders of magnitude higher than the one of the most lipophilic ion carriers used as selective components in liquid membrane electrodes reported so far. For such ion carriers of extremely high lipophilicity kinetic limitations of the carrier induced ion transfer between aqueous and membrane phase usually dominate and heavily disturb the electromotive behavior of the membrane electrode. These limitations are absent only in those cases where most of the lipophilic segments of the carrier may remain in the membrane phase while the segments with the coordination sites are exposed to the aqueous phase during the transfer process.