A turn-on fluorescent MOFs-based OCl− probe (ZIF-90-BA) was fabricated by post-functionally modifying ZIF-90 with the Schiff base group, which exhibited fast response, high selectivity and sensitivity to hypochlorite. The Schiff base group could be oxidized by OCl− and the flexible alkyl chain would put off, resulting in turn-on fluorescence behavior. [Display omitted] Hypochlorite/hypochlorous acid has been commonly regarded as one of the most vital reactive oxygen species in various physiological and pathological processes. However, the highly efficient detection of OCl− still remains a challenging work. Here, we fabricated a fluorescent MOF-based OCl− probe (ZIF-90-BA) by post-functionally modifying ZIF-90 with the Schiff base group. ZIF-90-BA features water stability, porous structures and functional sites. This probe was successfully used for OCl− turn-on fluorescence sensing. The Schiff base group on the ZIF-90-BA could be oxidized by OCl− and the flexible alkyl chain would put off, resulting in the turn-on fluorescence behavior. ZIF-90-BA exhibited high selectivity over other potentially interfering species, and it showed high sensitivity (detection limit: 6.25 μM) and fast response (15 s). It is anticipated that ZIF-90-BA can be a promising material for OCl− fluorescence sensing.

Polyhedron

Turn-on fluorescence detection; Hypochlorite detection; Metal–organic frameworks; Post-synthetic modification; Highly selective; Fluorescence; Schiff bases; Animal behavior; Investigations; Turn-on fluorescence detection; Hypochlorite detection; Metal–organic frameworks; Post-synthetic modification; Highly selective

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