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RISS 인기검색어
- 검색키워드
- 저자 : Jun-Hyeak Choi (검색결과 3 건)
- 무료
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Pandith, Anup,Choi, Jun-Hyeak,Jung, Ok-Sang,Kim, Hong-Seok Elsevier Sequoia [etc.] 2018 Inorganica chimica acta Vol.482 No.-
<P><B>Abstract</B></P> <P>A very simple, robust, and pico/nanomolar-sensitive 9,10-diethanolamine-substituted fluorescent Fe<SUP>3+</SUP>/CN<SUP>–</SUP> probe (<B>PD</B>) was synthesised, and its sensing abilities towards various ions were studied in mixed aqueous media. <B>PD</B> selectively recognised Fe<SUP>3+</SUP> ions through a ‘<I>turn on</I>’ response with an excellent binding constant (<I>K</I> <SUB>a</SUB>, 9.29 × 10<SUP>6</SUP> M<SUP>−1</SUP>) in 1:2 binding stoichiometry at pH 7.0 in phosphate-buffered saline (PBS). The <I>in situ</I> generated Fe<SUP>3+</SUP>·<B>PD</B> ensemble sequentially recognised CN<SUP>–</SUP> ions with an excellent binding constant (<I>K</I> <SUB>a</SUB> 1.72 × 10<SUP>8</SUP> M<SUP>−1</SUP>) via a ‘<I>turn off</I>’ mode by extruding Fe<SUP>3+</SUP> ions from the ensemble. The highly selective sequential ‘<I>on-off</I>’ responses towards Fe<SUP>3+</SUP> and CN<SUP>–</SUP> ions were attributed to inhibition and restoration of photoinduced electron transfer (PET) and chelation-induced enhanced fluorescence (CHEF) effects from the chelating N and O heteroatoms. <B>PD</B> was able to detect Fe<SUP>3+</SUP> and CN<SUP>–</SUP> ions in real water samples satisfactorily at picomolar to sub-nanomolar levels. A colorimetric assay based on pyrocatechol violet (<B>PCV</B>) was also able to detect Fe<SUP>3+</SUP>/CN<SUP>–</SUP> in a sequential manner (up to sub-micromolar level) by a change in colour from colourless to yellow/pale green without any interferences from other ions. Based on the complexation and decomplexation mechanism, bio-imaging photonic INHIBIT logic circuit strips were prepared for use under physiological conditions. In addition, solid-phase recognition of Fe<SUP>3+</SUP>/CN<SUP>–</SUP> ions was demonstrated using cost-effective paper-based strips.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 9,10-Diethanolamine-appended anthracene probe PD was synthesized and sensing abilities were studied in aqueous medium. </LI> <LI> Probe PD detected Fe<SUP>3+</SUP> and CN<SUP>–</SUP> sequentially through ‘<I>switch-on</I>’ and ‘<I>switch-off</I>’ responses. </LI> <LI> Pyrocatechol violet based colorimetric assay also is able to detect Fe<SUP>3+</SUP>/CN<SUP>–</SUP> in sequential manner by changing the color from colorless to yellow/pale green. </LI> <LI> Bio-imaging, photonic INHIBIT logic circuit strips were demonstrated at physiological conditions based on complexations and decomplexation mechanism. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kim, Hong-Seok,Bae, Seon-Yun,Kim, Ki-Soo,Choi, Jun-Hyeak,Choi, Heung-Jin,Shim, Jun-Ho,Cha, Geun-Sig,Nam, Hak-Hyun Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.2
The efficient synthesis of four mesitylene-based receptors 1-4 and their potentiometric response characteristics to alkali metal, alkaline earth metal, and transition metal ions, under various pH conditions are outlined. Receptor 1-based electrode exhibited more sensitive response to Ag+ ion (49 mV/decade of range from 10-6 to 10-2 M) than the 2-based electrode (47 mV/decade of range from 3 ´ 10-5 to 10-2 M), while the 3- and 4-based ones revealed sub-Nernstian below 40 mV/pAg+. All electrodes showed substantial responses to Ag+ ion under acidic condition, but there was almost nil-response to other transition metal ions (Fe2+, Co2+, Zn2+, Ni2+, Pb2+, Cd2+, Cu2+ and Hg2+). The association constant of receptor 1 toward Ag+ ion, measured by 1H NMR titration, showed the largest value (200 M-1) among the tested receptors. The results were interpreted with semi empirically-modeled structures.
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김홍석,최흥진,남학현,김기수,차근식,Seon-Yun Bae,Jun-Hyeak Choi,심준호 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.2
The efficient synthesis of four mesitylene-based receptors 1-4 and their potentiometric response characteristics to alkali metal, alkaline earth metal, and transition metal ions, under various pH conditions are outlined. Receptor 1-based electrode exhibited more sensitive response to Ag+ ion (49 mV/decade of range from 10-6 to 10-2 M) than the 2-based electrode (47 mV/decade of range from 3 ´ 10-5 to 10-2 M), while the 3- and 4-based ones revealed sub-Nernstian below 40 mV/pAg+. All electrodes showed substantial responses to Ag+ ion under acidic condition, but there was almost nil-response to other transition metal ions (Fe₂+, Co₂+, Zn₂+, Ni₂+, Pb₂+, Cd₂+, Cu₂+ and Hg₂+). The association constant of receptor 1 toward Ag+ ion, measured by 1H NMR titration, showed the largest value (200 M-1) among the tested receptors. The results were interpreted with semi empirically-modeled structures.
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