Highly selective and sensitive fluorescence chemosensor for the detection of palladium species based on Tsuji–Trost reaction

• We have designed a highly selective and sensitive chemosensor for palladium.
• Fluorescence intensity of NBDTC shows a large enhancement with turn-on over 50-fold in PEG400 under palladium species.
• NBDTC has lower detection limit of 1.13 × 10−9 M based on Tsuji–Trost reaction.

A new chemosensor 7-nitro-2,1,3-benzoxadiazole-4-allyl-N-(thiophen-2-ylmethyl)carbamate (NBDTC) was synthesized and utilized for palladium detection based on the Tsuji–Trost reaction. NBDTC displayed specific and ratiometric fluorescent responses toward palladium species. The chemosensor showed more than 50-fold enhancement in fluorescence intensity with the presence of PEG400 and palladium because NBDTC can be transformed to NBDT under palladium-catalyzing Tsuji–Trost reaction. NBDTC displayed high selectivity and sensitivity for palladium species with the detection limit of 1.13 × 10−9 M.

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