Journal
DALTON TRANSACTIONS
Volume 40, Issue 46, Pages 12578-12583Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt11307k
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Funding
- The Asia Research Center
- Chulalongkorn University
- Thailand Research Fund and Commission on Higher Education [RTA5380003]
- Thailand Research Fund Young New Staff [MRG5380167]
- center of excellence for innovation in chemistry (PERCH-CIC)
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Fluorescence-active chemosensors (L1-L4), comprising a rhodamine scaffold and a pseudo azacrown cation-binding subunit, have been proposed and characterized as a fluorescent chemosensor for Hg2+. An on-off type fluorescent enhancement was observed by the formation of the ring-opened amide form of the rhodamine moiety, which was induced by the interactions between Hg2+ and the chemosensor. Upon the addition of Hg2+, an overall emission change of 350-fold was observed, and the selectivity was calculated to be 300 times higher than Cu2+ for receptors L2-L4. A polymeric thin film can be obtained by doping poly(methyl methacrylate) or PMMA with chemosensor L2. Such a thin film sensor can be used to detect Hg2+ with high sensitivity and can be recovered using diluted NaOH.
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