Chromogenic Diaza-Crown Ether Dicarboxylic Acids for Determination of Calcium Ions
作者:Richard A. Bartsch、Eddy Chapoteau、Bronislaw P. Czech、Jan Krzykawski、Anand Kumar、Thomas W. Robison
DOI:10.1021/jo00082a019
日期:1994.2
The synthesis of two novel calcium chromoionophores 2 and 3, which are based on a benzodiazacrown ether with an inward-facing methoxyl group and bear two acetic acid groups and a 2,4,6-trinitroanilino chromophore, is described. Calcium and magnesium responses at pH optima are determined. Compound 2 exhibits a 31-nm bathochromic shift of the absorption maximum, an increase in the absorptivity upon complexation with Ca2+, and good selecitivity for Ca2+ over Mg2+ at pH 10.3. The response of chromoionophore 2 is linear from 0 to 8 X 10(-3) M Ca2+.