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Colormetric recognition

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https://www.readbyqxmd.com/read/28485571/development-of-an-inner-filter-effects-based-upconversion-nanoparticles-curcumin-nanosystem-for-the-sensitive-sensing-of-fluoride-ion
#1
Yan Liu, Qin Ouyang, Huanhuan Li, Zhengzhu Zhang, Quansheng Chen
This paper describes a novel ratiometric fluorescence-based sensor for the detection of fluoride ion. Yb(3+), Er(3+), and Tm(3+) codoped NaYF4 upconversion nanoparticles (UCNPs), which can emit fluorescence at 546, 657, 758, and 812 nm under the 980 nm single wavelength excitation, were synthesized, amino-modified and applied as the fluorescent signal indicator. The natural chemical curcumin served as specific recognition element and mixed with UCNPs to make a nanosystem. In this nanosystem, the absorption peak of curcumin shows a bathochromic shift when F(-) was added, causing an upconversion fluorescence quenching at 546 and 657 nm through inner filter effects (IFE), whereas the upconversion emission at 758 and 812 nm remained unchanged...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28340779/a-fluorescent-probe-based-upon-anthrancene-dopamine-thioether-for-imaging-hg-2-ions-in-living-cells
#2
Wenjie Feng, Qing Xia, Haiyan Zhou, Yun Ni, Liulin Wang, Su Jing, Lin Li, Wei Ji
A novel anthrancene-dopamine thioether L compound was designed as fluorescent probe for detecting Hg(2+) in living cells sample. L exhibits a good sensitive and selective recognition towards Hg(2+) ions in the presence of other important relevant metal ions and amino acids in HEPES solution. The addition of Hg(2+) causes a marked enhancement in the fluorescence emission intensity with the detection limit as low as 1.1×10(-6)M, combining with obvious colormetric change from colorless to pale brown. Mechanistic studies show that catechol group and sulfur atom in L all participate in the coordination with Hg(2+), though catechol group contributes mainly to chelation-enhanced fluorescence enhancement and sulfur atom to selectivity...
May 15, 2017: Talanta
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