Abstract
In this work, a new colorimetric and far-red to near-infrared fluorescent turn-on probe for rapid detection of palladium was reported. This probe uses a readily available seminaphthorhodafluor dye as the fluorophore and an allylcarbonate moiety as the reaction site. Based on the Pd0-triggered cleavage reaction, this probe shows rapid (within 2 min), selective, and sensitive response for palladium with different oxidation states (Pd0, or Pd2+ and Pd4+ in the presence of PPh3) in almost wholly aqueous solution under mild conditions, accompanied by distinct color changes and significant fluorescent turn-on signal in the far-red to near-infrared region. The detection limit of this probe for Pd0 was determined to be as low as 1.6 nM in solution. In addition, a sensitive bioimaging of palladiun in living cells can be achieved with a low level of this probe (2 μM), indicating the new developed probe has great potential for palladium detection in both solution and living systems.
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