A selective, sensitive probe for Hg (II) ions, 7-(diethylamino)-3-methyl-2H-benzo [b][1, 4] oxazine-2-thione (1), is developed. Compound 1 behaves as a ratiometric probe, exhibiting a large blue shift of 100nm in its absorption spectra upon exposure to Hg (II) ions. The dramatic color change of the solution made 'naked-eye'detection of Hg (II) ions possible. Emission spectra of 1 displayed a selective enhancement in intensity in the presence of ...
