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

DOI to cite this document:: 10.5283/epub.21004

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

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Abstract

A new calcium ion selective and water-soluble calix[4]arene chromoionophore has been synthesised from the 25,27-bis[(ethoxycarbonyl)methoxyl-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)-derived 2,4-bis-[(ethylcarbonyl)methoxy]-calix[4]arene (3) was obtained by introducing sulfonic groups into a ...