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A novel fluorescent probe (JSS-1) for endogenous SO2 derivatives was developed by using 1,8-naphthalimide and malononitrile dyes on the basis of FRET and the ICT mechanism. JSS-1 possessed excellent photo-stability, deep-red emission signal, large Stokes shift and broad emission window gap. Additionally, it displayed various superiorities in sensing SO2 derivatives, including low sensing limit, high sensitivity and selectivity. Significantly, JSS-1 was successfully employed to track endogenous SO2 derivatives in the endoplasmic reticulum with a high co-localization coefficient of 0.93, and could even be used for the recognition of liver cancer cells. [ABSTRACT FROM AUTHOR]

Visible-light-excited fluorescent probes with excellent water solubility are of significant research importance in the biomedical field. In this work, a series of visible-light-responsive carbocyanine fluorescent compounds [DiSCn(3)] are synthesized from 2-methylbenzothiazole and are employed as fluorescent probes for detecting tin(II) ions. Upon addition of tin(II) ions to an aqueous solution of compounds DiSCn(3)-3 and 4, both exhibit considerable changes in their absorption and fluorescent intensity, respectively. These spectral changes may correspond to the binding between tin(II) ions and the sulfur atom in the benzothiazole unit to form a metal complex. This indicates that DiSCn(3)-3 and 4 can be used as promising fluorescent chemical sensors for detecting tin(II) ions in aqueous solution via visible-light excitation. [ABSTRACT FROM AUTHOR]