Hydrophilic sensor membrane based on cation-selective protic chromoionophore |
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Authors: | Ch Krause T Werner Ch Huber O S Wolfbeis |
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Institution: | Institute of Analytical Chemistry, University of Regensburg, Chemo- and Biosensors, D-93040 Regensburg, Germany e-mail: tobias.werner@chemie.uni-regensburg.de, DE
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Abstract: | 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 based chromophores the highly pre-organized moiety allows ion detection even in aqueous environment. The detection limit for potassium ions at ¶pH 7.7 is 5 μM. |
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