Abstract
A naked-eye colorimetric and fluorescent response dual-channel Schiff base chemosensor (L1) with simple structure and excellent performance was synthesized by the ammoniacal aldehyde condensation reaction of 6-amino coumarin with 4‑methoxy salicylaldehyde. The chemical sensor L1 showed high sensitivity and selectivity to HSO4− that caused obvious colorimetric (from yellow to colorless) and fluorescent (from no fluorescence to orange fluorescence) response in mixed solvents (EtOH/H2O, v/v = 9:1). And the binding constants (Ka) and limit of detection (LOD) for HSO4− were 6.4 × 103 M−1 and 4.63 × 10−7 M, respectively. The 1H NMR and HR-MS studies confirmed that the sensing mechanism for L1 was attributed to CN hydrolysis cleavage promoted by HSO4−. L1-loaded test strips could be employed for detecting HSO4− under daylight and 365 nm UV light without resorting to any expensive instrumentation. In addition, it was also applied to the detection of trace HSO4− in simulated water samples, including drinking water, and tap water. It was worth mentioning that L1 has been successfully used to recognition of HSO4− in the Zebrafish organism, indicating that the practical application of sensor L1 in the field of biology and environment provided the possibility.
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