A New Rhodamine‐based Fluorescent Probe for the Discrimination of Fe³⁺ from Fe²⁺

Abstract

A new rhodamine-based fluorescent probe for the discrimination of Fe 3+ from Fe 2+ has been designed and investigated. The probe shows an immediate visual color change in response to Fe 3+ and Cu 2+ , while only Fe 3+ triggers the fluorescent change of the probe. The existence of large amount of other metal ions shows negligible interference in the detection of Fe 3+ . The association constant K ass of 4.64 × 10 8 M −2 (R 2 = 0.994) and 5.38 × 10 8 M −2 (R 2 = 0.991) of the complex was derived from UV/Vis and fluorescence titration assuming 1:2 stoichiometry of probe-Fe 3+ complex, respectively.