A novel dual-mode turn-on optional chemodosimeter for the visualization of Pd0 with a low detection limit

Abstract Rhodol is an ideal platform for fluorescent probes owing to its spirolactone framework and excellent photochemical properties. Herein, a novel rhodol-based colorimetric and fluorescent turn-on probe, DER-1 , for the detection of Pd 0 , was rationally developed with an allyl carbamate group as the response unit. Base on the Pd 0 -triggered cleavage reaction and rhodol spiroring-opening mechanism, the proposed probe exhibited a high selectivity and sensitivity towards Pd 0 . Upon addition of Pd(PPh 3 ) 4 , a significant fluorescence enhancement at 547 nm was observed with an obvious color change from colorless to pink, which can be easily identified by naked-eye. In addition, the fluorescence intensity at 547 nm was linearly proportional to the concentration of Pd 0 in the range of 0–1.5 μM, and the detection limit was calculated to be 1.14 nM. That is, probe DER-1 can be quite a sensitive fluorescent turn-on probe for the quantitative detection of Pd 0 in pretty low dose.