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We herein reported a click strategy to fabricate two kinds of colorimetric and turn-on fluorescent dual-modal mercury sensors (PEG-DMS) based on the styryl BODIPY scaffold attached to a hydrophilic polymer PEG, where the PEG chain could effectively improve the water solubility of these two mercury sensors and mean that their Hg2+ detection could be performed in pure water, while their corresponding small molecular precursor DMS could only detect Hg2+ in the mixed medium with a large amount of organic solvent. It is interesting that PEG-DMS exhibits an excellent spectral response to Hg2+ by inhibiting the intramolecular charge transfer (ICT) effect from the Hg2+ specific ligand, dithia-dioxa-aza cyclopentadecane, to the BODIPY core. Upon addition of Hg2+, a significant fluorescence enhancing property in conjunction with a visible colorimetric change can be observed. These two sensors are highly selective …