Abstract
In this paper, a new colorimetric and ratiometric fluorescent probe was developed for rapid detection of palladium in aqueous solution under mild conditions. This probe is based on a novel phthalimide-rhodol dyad, which has a unique ESIPT-FRET mechanism to give the desired ratiometric fluorescent signal changes. Optical sensing studies showed that this probe not only has high selectivity and sensitivity for palladium with a low detection limit of 31 nM, but also exhibits rapid and distinct colorimetric and ratiometric fluorescent signal changes with a large pseudo Stokes shift. In addition, the probe was successfully used for fluorescent imaging of palladium in living cells. Overall, this work provided a new ESIPT-FRET platform for development of ratiometric probes and a new attractive colorimetric and ratiometric fluorescent probe for detection of palladium.
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