Recently, reaction-based probes or chemodosimeters for selective and sensitive Hg2+detection have been extensively studiedand are well documented [4,5]. Representative examples include those based on Hg2+-promoted desulfurization [6–8] and desul-furization followed by cyclization [9,10]. Hg2+-induced hydrolysisreactions [11,12], mercuration [13], and hydration of vinyl ether[14] are other unique reaction-based strategies used to realizeselective detection of mercury species. Cleavage of protectinggroups on the phenolic moiety of a latent fluorochrome is fre-quently employed as a design strategy for probes based on variousversatile dyes such as fluoresceins and resorufin. Notable exam-ples of these include hydrogen peroxide probes that exploit the