Fluorescent polymeric sensors based on N-(rhodamine-G) lactam-N′-allyl-ethylenediamine and 7-(allyloxy)−2H-chromen-2-one for Fe3+ ion detection

Abstract

In this study, N-(rhodamine-6G) lactam-N′-allyl-ethylenediamine (RH6GAB) and 7-(allyloxy)−2H-chromen-2-one (AC) as fluorescent monomers were synthesized and characterized by FT-IR, and proton nuclear magnetic resonance (1H NMR). Poly(acrylamide-co-AC) P(AAm-co-AC), P(AAm-co-RH6GAB), P(AAm-co-RH6GAB-co-AC), and P(AAm-co-AC)-b-(AAm-co-RH6GAB) copolymers were synthesized via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Copolymers were characterized using 1H NMR and FT-IR. For selective photo-sensing of metal ions, optical chemosensors based on rhodamine 6G and coumarin chromophores were synthesized. The rhodamine 6G exhibits exceptionally strong fluorescence emission and coloring properties that are useful in sensing applications. Metal ion (Fe3+, Ni2+, Cu2+, Cd2+, Co2+, and Pb2+) selectivity of P(AAm-co-AC), P(AAm-co-RH6GAB), P(AAm-co-RH6GAB-co-AC), and P(AAm-co-AC)-b-(AAm-co-RH6GAB) were investigated by fluorescence spectrophotometry. Obtained results indicated that coumarin- and rhodamine-based copolymers can be used for selective detection of Fe3+.