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Hydrophilic sensor membrane based on cation-selective protic chromoionophore

Krause, Christian ; Werner, Tobias ; Huber, Christian ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 06 Jun 2011 12:38


The first potassium optode based on a protic chromoionophore immobilized in a hydrogel matrix is presented. The highly selective protic chromoionophore consists of a cryptohemispherand moiety and a trinitroanilino chromophore part. The acidifying power of potassium ions over sodium ions is 0.6 pH units. This correlates with the findings in solution. In contrast to several crown and aza-crown ...


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