A dual colorimetric and near-infrared fluorescent turn-on probe for Hg2+ detection and its applications

摘要

The increasing He2+ contamination in environment and ecosystem has gained wide attention and thus demand; for its facile and effective detection. In this study, we constructed a new fluorescent probe (E)-2-(2-(3-(1,3- dithian-2-yl)-4-hydroxystyryl). 4H-chromen-4-ylidene)malononitrile (DCM-Hg) for Hg2+ detection by in corporating the 1, 3-dithiane group to the dicyanomethylene-4H-pyran fluorophore for the first time. This probe can selectively detect Hg2+ via the Hg2+-triggered deprotection reaction of thioacetals, which leads to a distincit color change from purple to pink and obvious fluorescence enhancement in the near-infrared (NIR) region. The NIR fluorescence intensity increased linearly with Hg2+ level within the range from 0 to 100 pM and the de tection limit of DCM-Hg for Hg2+ was found to be 6.8 x 10(-8) mol/L. Moreover, the probe could sense Hg2+ or paper strips and image Hg2+ in living cells with low cytotoxicity, which demonstrates its potential application it environment and biological science.