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A colorimetric displacement assay system for F − and H 2 PO 4− anions based on a 2,6-dichlorophenol-indo-o-cresol sodium salt:calix[4]arene-p-sulfonate complex was studied in 1:1 DMSO:water solution. When calix[4]arene-p-sulfonate formed the complex with the blue 2,6-dichlorophenol-indo-o-cresol sodium salt dye, the absorption peak of the dye at 625 nm disappeared and...
A highly selective colorimetric displacement assay for anions, F− and H2PO4−, based on calix[4]arene-Reichardt’s dye was studied in DMSO. When calix[4]arene forms a complex with Reichardt’s, the absorption peak at 386, 419 and 632 nm disappeared. Addition of anions to solution of calix[4]arene-Reichardt’s dye causes the blue color of Reichardt’s dye to return as it is displaced from the calix[4]arene...
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