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

Spectrochim Acta A Mol Biomol Spectrosc

School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. Electronic address:

Published: January 2025

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 anions, with a detection limit LOD=1.59 × 10 M. The binding constant Ka = 3.7 × 10 M and quantification limit is as low as LOQ=4.31 × 10 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 anions, enhancing its fluorescence and producing a ICT effect.

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http://dx.doi.org/10.1016/j.saa.2024.125102DOI Listing

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