A rare extra-long flexible salamo-based bisoxime as highly efficient and selective probe for fluorescent identification of CO32− ion and mechanism exploration.

[Display omitted] • An ultra-long carbon-chain salamo-like probe DNS was synthesized. • The probe DNS molecule has efficient and specific recognition for CO 3 2−. • The minimum detection limit of the fluorescent probe DNS is superior to other reported methods. A novel extra-long carbon-chain salamo-like fluorescent chemical probe DNS (named as 2,2′-[1,10-(decanedioxy)bis(nitromethyldyne)]dinaphthol) containing ten methylene groups was synthesized based on the 2-hydroxy-1-naphthylaldehyde unit. Research has shown that the fluorescent probe DNS can achieve efficient and selective recognition of CO 3 2− anions, with a detection limit LOD=1.59 × 10−8 M. The binding constant Ka = 3.7 × 104 M−1 and quantification limit is as low as LOQ=4.31 × 10−8 M, respectively. The possible identification mechanism of the fluorescent chemosensor DNS was analyzed and studied through fluorescence titration and nuclear magnetic titration. The results showed that the fluorescence chemical sensor DNS is deprotonated by CO 3 2− anions, enhancing its fluorescence and producing a ICT effect. [ABSTRACT FROM AUTHOR]

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