• Bulletin of the Korean Chemical Society
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• v.31 no.1
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• pp.246-249
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• 2010

• Bulletin of the Korean Chemical Society
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• v.32 no.11
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• pp.3959-3962
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• 2011

A simple propargylamide-fuctionalized chemodosimeter was prepared for the ratiometric fluorescence detection of mercuric ions in HEPES buffer. The chemodosimeter exhibited $Hg^{2+}$-induced propargyl amide-tooxazole transformation, with a significant accompanying ratiometric change in fluorescence. It afforded high selectivity for mercuric ion detection without any competitive inhibition by common alkali, alkaline earth, or other transition metal ions. The probe showed a $17{\times}10^{-6}M$ detection limit for $Hg^{2+}$ ions and potential applicability for detecting aqueous $Hg^{2+}$ ions.

• Bulletin of the Korean Chemical Society
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• v.34 no.6
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• pp.1871-1874
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• 2013

• Bulletin of the Korean Chemical Society
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• v.29 no.3
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• pp.571-574
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• 2008

The well-known Cu2+-selective chemodosimetric behavior of rhodamine B hydrazide was successfully switched to selectivity for Hg2+. The fluorescence signaling is remarkably selective toward Hg2+ ions compared to other common biologically and environmentally important metal ions, including Cu2+ ions. The detection limit was 0.2 mM in an acetate-buffered aqueous 10% methanol solution at pH 5. The OFF-ON type of signaling is due to the selective Hg2+-induced hydrolysis of the lactam ring of the hydrazide as has been reported for the standard Cu2+-signaling process of the same compound. A simple change in medium resulted in clear switching of selective signaling from Cu2+ to Hg2+, which extends the applicability of the easily accessible hydrazide derivative.

• Bulletin of the Korean Chemical Society
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• v.31 no.12
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• pp.3539-3542
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• 2010

Selective mercuration at the 1,6-positions of 2-hydroxy derivative of Nile Red and its application towards $Hg^{2+}$-selective signaling was investigated. The 2-hydroxy Nile Red exhibited a selective UV-vis absorption and fluorescent signaling behavior towards $Hg^{2+}$ ions over common coexisting physiologically important metal ions in aqueous environment. $^1H$ NMR studies revealed that the mercuration was selectively effected at the 1,6-positions of 2-hydroxy Nile Red, which is quite different from that at the 6,8-positions for the parent Nile Red.