A selective colorimetric and fluorescence chemosensing sensor for Cr3+ based on a rhodamine base derivative

摘要

A rhodamine-conjugated coumarin (L) was used in designing a selective fluorescence chemosensor for the determination of trace amounts of Cr3+ ions in acetonitrile-water (MeCN/H2O (90:10, %v/v) solutions. The intensity of the fluoresce emission of the chemosensor is intensified upon addition of Cr3+ ions in MeCN/H2O (90:10, %v/v) solutions, due to the formation of a selective 1:1 complex between L and Cr3+ ions. The fluorescence enhancement versus Cr3+ concentration has been found to be linear from 1.0 x 10(-7) to 1.8 x 10(-5) M and a detection limit of 7.5 x 10(-8) M. The proposed fluorescent probe proved to be highly selective towards ions as compared to other common metal ions and could be successfully applied to the determination of Cr3+ concentrations in some water and wastewater samples.