Abstract
The dichromate as an industrial oxidant has a very extensive application. However, as one of the heavy metal elements, chromium has become a great threat to the organism and environment due to its carcinogenicity and mutageicity. So far, there is only a small number of detection and imaging methods for dichromate. In this work, a new fluorescent probe RhoCr for detecting dichromate based on in situ Cr3+-controlled opening of spirolactam-ring in a rhodamine dye after Cr2O72− reduced to Cr3+ by NaHSO3 in solution and self-reduction in organism is reported, which displays a strong enhancement of fluorescence emission (λem 582nm), fast response (completed within 2min) and excellent sensitivity (DL 1.18nM). RhoCr successfully obtained fluorescence images of the intracellular Cr2O72−. In addition, the effect have been exhibited in tap water and pool water, which will be crucial to the detection of dichromate in the environment.
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