Fluorescent sensors for amino acid anions based on calix[4]arenes bearing two dansyl groups

Abstract Two novel types of chiral calix[4]arenes containing hydrazide and dansyl groups were synthesized and examined for their enantioselective recognition abilities by the fluorescence and 1 H NMR spectra in CHCl 3 . The results indicate that both 4a and 4b have excellent enantioselectivities to the N -protected alanine or phenylalanine anions.