A simple and effective fluorescent probe based on rhodamine B for determining Pd2+ ions in aqueous solution

Abstract

A new simple-structure fluorescent probe RL based on the special affinity of Pd²⁺ to double bond ligands has been designed and synthesized. RL shows high selectivity and sensitivity for Pd²⁺ with a detection limit of 21.3 nM (2.3 ppb) in the presence of other competing metal ions in aqueous media. Furthermore, RL has potential applications in Pd²⁺ analysis in natural water and in a reactor involving a Pd²⁺catalytic reaction.