Abstract
For highly sensitive and selective detection of biologically important Fe3+ in aqueous media, a novel near-infrared (NIR) fluorescent probe (λem=627nm; ΦF=0.47) based on boron-dipyrromethene (BODIPY) was developed. Employing a pair of 2-sulfonatostyryl sidearms attached to the BODIPY core as a reversible chelator specific to Fe3+, the sensor achieved a high selectivity toward Fe3+ over a wide range of metal ions, including Li+, Na+, K+, Mg2+, Ca2+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Al3+, and Cr3+. Furthermore, the quenched NIR fluorescence was immediately recovered upon addition of sodium ascorbate as a reductant or EDTA as a stronger chelator.
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