• JU BYEONG CHAE

      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.

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