A tetraester derivative of fluorescent calix[4]arene bearing a proton-ionizable moiety for highly sensitive extraction-fluorometric determination of sodium ion
Abstract In this study, we report the highly sensitive extraction-fluorometric detection system of Na+ using flow injection analysis with a tetraester derivative of fluorescentcalix[4]arene. In liquid-liquid extraction experiments, the fluorescent intensity of calix[4]arenederivative 1 bearing a p-nitrophenol moiety was highly dependent on pH and the Na+ concentration in the aqueous phase. On the