Determination of Er3+ using a highly selective and easy-to-synthesize fluorescent probe based on Rhodamine 6G

Abstract

A inducible fluorescent ligand 2-(2-(2-amino-ethylamino) ethyl)-3′,6′- bis (ethylamino)-2′, 7′-dimethy-lspiro[isoindoline-1,9′-xanthen]-3-one was synthesized and used as a fluorescent probe to detect Er3+. Er3+ could induce the structural transformation of the fluorescent ligand, resulting in a sharp fluorescence emission in a buffered solution. The fluorescence intensity of the fluorescent ligand was enhanced quantitatively with an increase in the concentration of erbium ion. The detection limit of Er3+ was 3.0 × 10−10 mol L−1 (50 ng L−1) under optimized conditions. The method applied for the determination of Er3+ in four alloy samples had achieved satisfactory results. Keywords: Fluorescence probe, Rhodamine 6G, Diethylenetriamine, Enhancement, Erbium ion