A rhodamine B thiohydrazide-based fluorescent turn-on chemosensor (RN2) for Hg2+ was designed and described. RN2 exhibited very high sensitivity and selectivity towards Hg2+ over other metal ions. Due to the opening of the spiro ring in rhodamine B caused by Hg2+, the RN2 displayed selective ‘off–on’ type fluorescence enhancement and a distinct color change. The results of biological imaging studies demonstrated that this probe was cell permeable and could be used as a fluorescent probe for monitoring Hg2+ in living cells. The as-prepared chemosensor was also successfully applied to detect Hg2+ in environmental water samples.
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Wang et al. (2012) studied this question.
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