• 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

      More Details Abstract Fulltext PDF

      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

      More Details Abstract Fulltext PDF

      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

      More Details Abstract Fulltext PDF

      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.

    • A novel fluorescent chemosensor based on carbazate moiety for detection of Zn2+

      DONGHWAN CHOE CHEAL KIM

      More Details Abstract Fulltext PDF

      A novel carbazate-based fluorescent sensor BC-MS was developed for the detection of Zn2+. Inthe presence of Zn2+, BC-MS showed a strong fluorescence enhancement with a 1:1 stoichiometry. Significantly,BC-MS could determine the presence of Zn2+ without the inhibition of Cd2+. The detectionmechanism of BC-MS toward Zn2+ was proposed through analytical tools like UV-vis spectroscopy, Jobplot, ESI-MS, 1H NMR titration and theoretical calculations.

      A novel carbazate-based fluorescent sensor BC-MS was developed for detection of Zn2+ BC-MS showed a strong fluorescence enhancement in the presence of Zn2+ without the inhibition of Cd2+. The detection mechanism of BC-MS to Zn2+ was supported by theoretical calculations.

    • Selective detection of Cu2+ by benzothiazole-based colorimetric chemosensor: a DFT study

      JAE SUNG HEO BOEON SUH CHEAL KIM

      More Details Abstract Fulltext PDF

      An effectively selective colorimetric chemosensor BTV (2-methoxy-6-((E)-(((E)-3-methyl-benzo[d]thiazol-2(3H)-ylidene)hydrazono)methyl)phenol) was synthesized for detecting Cu2+. The BTV having benzothiazole group showed a bathochromic shift (150 nm) with an explicit color variation fromcolorless to pink toward Cu2+. The BTV could detect Cu2+ down to 0.37 μM in solution. The binding ratio of BTV and Cu2+ was determined to be a 1:2 by Job plot and ESI-MS. Sensor BTV could distinctly sense Cu2+ without interference from other cations and distinguish it from diverse metal ions through the test strip. The sensing process of Cu2+ by BTV was presented by UV-visible titration, Job plot, 1H NMR titration, DFT calculation, FT-IR and ESI-MS.

      An effective colorimetric chemosensor BTV was synthesized for detecting Cu2+. Sensor BTV showed a bathochromic shift (150 nm) with an explicit color change from colorless to pink to Cu2+. In addition, it could detect Cu2+ down to 0.37 μM and distinguish it from various metal ions through the test strip.

  • Journal of Chemical Sciences | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.