Abstract
Due to its great toxicity to the bio-aquatic environment, developing highly selective and sensitive probes for the detection of mercury ions in solutions as well as in living cells is a major problem. To detect Hg2+ ions in organic semi-aqueous solutions, we created a fluorescent probe called 4-(1, 3-dithian-2-yl)-1,1-diphenyl- λ5-phosphinine-2,6-dicarbonitrile (DDPD) with optical behaviour. Through the Hg2+-promoted deprotection process of thioacetals, which was followed by considerable changes in fluorescence colour and spectral pattern, the probe DDPD selectively detected Hg2+ ions in a broad pH range with a detection limit of 56 nM. Specifically, DDPD can be used to qualitatively identify Hg2+ ions using test strips made of Whatman filter paper and also in HeLa cells it can identify Hg2+ ions and image them using fluorescent microscopy.
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