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New longwave absorbing chromogenic calix[4]arene for calcium determination in aqueous environment

DOI to cite this document:
Werner, Tobias ; Kürner, Jens M. ; Krause, Christian ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 06 Jun 2011 12:31


A new calcium ion selective and water-soluble calix[4]arene chromoionophore has been synthesised from the 25,27bis[(ethoxycarbonyl)methoxy]-26,28-dihydroxy-calix[4]arene (1) and the N4,N4-diethyl-2-methyl-1,4-phenylenediamine-6-sulfonic acid (2). The 1,3-bis(indoaniline)-derived2,4bis-[(ethylcarbonyl)methoxy]-calix[4]arene (3) was obtained by introducing sulfonic groups into a ...


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