• CHEAL KIM

      Articles written in Journal of Chemical Sciences

    • A novel benzophenone-based colorimetric chemosensor for detecting Cu2+ and F-

      DONGJU YUN JU BYEONG CHAE CHEAL KIM

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      A novel selective colorimetric chemosensor ANBP ((E)-(2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5Hpyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)-5-nitrophenyl)(phenyl)methanone), based on the combination of benzophenone group and julolidine chromophore, was synthesized. Sensor ANBP showed rapid colorimetric responses toward Cu2+ (pale orange to pink) and F- (orange to blue). The detection limit by ANBP to Cu2+(6.82 µM) was far below WHO guideline value (31.3 µM). Moreover, ANBP could quantify Cu2+ in aqueoussamples. 1:1 binding mode between ANBP and Cu2+ or F- was proposed by ESI-mass analyses and Job plots. The remarkable color changes with Cu2+ and F - resulted from the intramolecular charge transfer (ICT) effect, which was demonstrated by theoretical calculations.

    • An imine-based colorimetric chemodosimeter for the detection of hypochlorite (ClO- ) in aqueous media: its application in test strips and real water samples

      DONGJU YUN JU BYEONG CHAE CHEAL KIM

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      A highly selective colorimetric chemodosimeter ASAD, (E)-2-((4-(diethylamino)-2-hydroxybenzylidene) amino)-5-methoxybenzenesulfonic acid, was readily synthesized and characterized. The probe ASAD could selectively recognize hypochlorite (ClO-) through an oxidative cleavage of C=N bond with acolor change from yellow to colorless and detected it down to a low concentration of 0.95 μM. Importantly, ASAD could be employed as a practical and efficient optical sensor for ClO− in test strips and water samples. Moreover, the detection process of ASAD to hypochlorite was demonstrated by UV-vis spectroscopy, NMR titration and theoretical calculations.

    • A conjugated Schiff base-based chemosensor for selectively detecting mercury ion

      AHRAN KIM SEHOON KIM CHEAL KIM

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      A novel conjugated Schiff base-based chemosensor DAP, N¢-((1E,2E)-3-(4-(dimethylamino) phenyl)allylidene)-3-nitrobenzohydrazide, has been synthesized. DAP showed significant selectivity toward mercury ion by color change of pale yellow to orange. Detection limit was 0.11 lM, which is lowerthan the value (2.48 lM) recommended by Health Canada. DAP could recognize and quantify mercury ion in real water samples. The binding mode of DAP and Hg2+ was demonstrated, based on Job plot, IR spectra and ESI-MS.

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