Abstract
This work represents a napthalimide derived fluorescent sensor for the selective and sensitive detection of Hg2+ utilizing the thioacetal group as a sensing unit. The immense selectivity of 6-(4-(1,3-dithian-2-yl)phenyl)-2-(2-morpholinoethyl)-1H benzo[de]isoquinoline-1,3(2H)-dione (TNA) has been investigated in ACN: H2O (8:2) system and the rapid response towards Hg2+ was found to be 10 s. In detecting Hg2+, TNC exhibits a blue emission (λmax = 429 nm), and the limit of detection was evaluated to be 3.3 nM. The sensing mechanism describes that the Hg2+ induces colorless to blue fluorescence-enhancement at 429 nm originated from the de-thiolation of an aldehyde. This stimulates the ICT process of TNA which resulted in the enhancement in fluorescence. Moreover, the sensor ligand was effectively applied for imaging Hg2+ in E-coli live cells.
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