Seon-Yeong Gwon

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (45)82.68 Total impact

  • Seong-Min Ji, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: Two new hemicyanine dyes with dihydroxybenzene moiety as a donor group have been investigated in terms of interacting with volatile organic compounds (VOCs) EtNH2, The sensing behavior of the hemicyanines toward EtNH2 was studied by UV-vis absorption spectroscopy. Different sensing mechanism of the dyes to EtNH2 was confirmed by (NMR)-N-1 studies, together with theoretical calculations based on DFT and PPP-MO methods. We have also investigated the fast EtNH2 gas sensing of these dyes loaded poly(acrylonitrile) nanofiber. Reversible response and recovery were achieved using alternating gas exposure. This system shows a fast EtNH2 gas sensing within 5 s.
    Dyes and Pigments 09/2014; 108:93–97. DOI:10.1016/j.dyepig.2014.04.030 · 3.47 Impact Factor
  • Young-A Son, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A chemosensor having electron pushing donor and pulling acceptor material based on conjugation bridges, namely D-π-A structural chemosensor, was herein designed and synthesized. This chemosensor 3 contained guajazulene and indole moieties, which was synthesized through a one-step condensation reaction. The synthesized material showed very selective sensing properties towards anions. Upon the addition of CN- and F-, the remarkable changes in absorption spectra were monitored. However, each of others did not show any noticeable optical changes. The original intramolecular charge transfer system of chemosensor 3 was altered by the formation of N- at iindole moiety with anion reaction: caused by the deprotonation of NH at the indole moiety of chemosensor. With intermolecular charge transfer system between chemosensor 3 and anions, the electron density and distribution were determined by frontier calculation method.
    Molecular Crystals and Liquid Crystals 09/2014; 600(1). DOI:10.1080/15421406.2014.937294 · 0.49 Impact Factor
  • In-Sub Shin, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A new charge-transfer (CT) complex, consisting of 2,3-dichloro-5-nitro-1,4-naphthoquinone and biothiols such as cysteine (Cys), homocysteine (Hcy), and glutathione (GSH) has been designed to sensing biothiols. The method is selective and sensitive for biothiols detection without the interference of other amino acids.
    Fibers and Polymers 04/2014; 15(4):891-893. DOI:10.1007/s12221-014-0891-7 · 1.11 Impact Factor
  • In-Sub Shin, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A new highly selective probe for biothiols, squarylium dye (SQ), was designed and synthesized. The probe displayed a color change from blue to colorless upon reaction with biothilos such as cysteine (Cys), homocysteine (Hcy) and glutathione (GSH). The competition experiments revealed that no obvious interference was observed by performing the titration with the mixtures of Cys and other amino acids. The results indicated that SQ was highly selective for Cys detection. Moreover, SQ could also serve as a "naked-eye" probe for Cys with a minimum detectable concentration of approximately 4μM.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2013; DOI:10.1016/j.saa.2013.10.066 · 2.13 Impact Factor
  • Eun-Mi Lee, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A (E)-2-(2-(2-(1H-indol-3-yl)vinyl)-4H-chromen-4-ylidene)malononitrile (dye 1) was synthesized and its cation sensing properties in DMSO were investigated by UV-vis spectroscopy. Upon the addition of Hg(2+), the solution of dye 1 showed color change and the absorption band shows a formation of a 1:1 dye 1-Hg(2+) coordination complex. The dye 1 exhibited high selectivity for Hg(2+) as compared with other cations. Interestingly, the dye 1-F(-) complex also could be recovered by adding Hg(2+). We have investigated the ability of complex formation based on the association constant, Kass; the binding ability for the complex formation of dye 1-F(-) and Hg(2+) is greater than that of the dye 1 with F(-).
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2013; DOI:10.1016/j.saa.2013.10.061 · 2.13 Impact Factor
  • Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A new donor-π-acceptor (D-π-A) type dye was synthesized by the condensation reaction between 2-cyanomethylene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran and 4-imidazolecarboxaldehyde. The chemical structure of the dye was characterized by (1)H NMR, EA and MS. A novel chromogenic dye based on imidazole as donor unit and furan as acceptor unit displayed marked UV-visible absorption changes in the presence of fluoride ion. The levels of energy potential and the electron density distributions of this dye were also simulated and discussed using computational model calculation. The reversible photoreaction of the dye-F(-) complex was studied by time-dependent UV-visible absorption spectra.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 08/2013; 117. DOI:10.1016/j.saa.2013.08.062 · 2.13 Impact Factor
  • Source
    Jin-Seok Bae, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A new assembly derived from 2,3-dibromo-5,6,7,8-tetrafluoroquinizarin and sodium diethyl-carbamodithiolate, was prepared as an efficient colorimetric chemosensor with high selectivity over other cations , , , , , , , , , : from the dark blue to brown color change that is visible by eyes. This assembly produced large bathochromic shift of 228 nm in the presence of compared with the corresponding absorption maximum of the parent dye.
    03/2013; 25(1). DOI:10.5764/TCF.2013.25.1.13
  • Eun-Mi Lee, Seon-Yeong Gwon, Young-A Son, Sung-Hoon Kim
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    ABSTRACT: A chemosensor based on symmetrical squarylium (SQ) dye, 2,4-bis((3,3-dimethylindolin-2-ylidene)methyl)cyclobutane-1,3-bis(olate), was synthesised and its cation-sensing properties in acetonitrile were investigated by UV–vis spectroscopy. Upon the addition of Hg2+, the solution of SQ dye showed clear colour change. The absorption studies also indicate a higher affinity of Hg2+ towards the formation of 2:1 complexes, which is in good agreement with the experimental results. The selective detection of Hg2+ of the symmetrical-SQ unit gave rise to a significant absorption decrease at λmax 650 in acetonitrile solution.
    Supramolecular Chemistry 02/2013; 25(2). DOI:10.1080/10610278.2012.752086 · 2.13 Impact Factor
  • Eun-Mi Lee, Seon-Yeong Gwon, Young-A Son, Sung-Hoon Kim
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    ABSTRACT: The interaction between carbazole and 2-chloro-3,5-dinitrobenzotrifluoride-ethylamines, (mono-, di-, and triethylamine) charge-transfer complex in DMSO was studied using fluorescence spectroscopy. The positive deviation from linearity has been observed in the Stern-Volmer plots. The experimental results showed that the fluorescence of carbazole was quenched by 2-chloro-3,5-dinitrobenzotrifluoride-ethylamines charge-transfer complex through a combined quenching procedure. The Stern-Volmer quenching constants, K(SV), have been determined and found to be greater quenching efficiency of ethylamine. Carbazole/2-chloro-3,5-dinitrobenzotrifluoride loaded PMMA film was exposed to ethylamine vapor, where the resulting absorption and emission changing properties were clearly monitored.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 11/2012; 103. DOI:10.1016/j.saa.2012.11.035 · 2.13 Impact Factor
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    ABSTRACT: A new designed dye sensor based on indole as a donor unit and benzothiazole as an acceptor unit have provided very clear optical switching functions when monitored with a pH triggered molecular chemosensor effects in the presence of alkali/acid addition. The prepared dye sensor shows cleared fluorescence quenching effect with alkali addition. The level of energy potential and the electron distribution of this compound were calculated by computational simulation approaches.
    Fibers and Polymers 11/2012; 13(9). DOI:10.1007/s12221-012-1101-0 · 1.11 Impact Factor
  • Eun-Mi Lee, Seon-Yeong Gwon, Young-A Son, Sung-Hoon Kim
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    ABSTRACT: A novel dye chemosensor based on indole as a donor unit and quinaldium as an acceptor unit have caused promising optical changes when used as a reversible, pH-induced, molecular switching in the presence of alkali/acid stimulus. The dye chemosensor also exhibited marked fluorescence quenching in the presence of alkali addition, which are based on intramolecular charge transfer (ICT) system.The level of energy potential and the electron flowing of this dye chemosensor such as HOMO and LUMO values were calculated by computational calculation approaches.
    Molecular Crystals and Liquid Crystals 11/2012; 566(1):106-111. DOI:10.1080/15421406.2012.701851 · 0.49 Impact Factor
  • Yu Wang, Seon-Yeong Gwon, Young-A Son, Sung-Hoon Kim
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    ABSTRACT: The selectivity and sensitivity of a benzoindolium heptamethine cyanine dyes toward CN- and F- in DMSO are described. These anions interact with Dye-1 and Dye-2 forming anion-Dye adducts, the formation of which was supported by the Pariser-Parr-Pople molecular orbital (PPP MO) calculation. The different optical responses in Dye-1 stimulated by addition of CN- (blue to pale yellow) and F- (blue to pink) allow simultaneous estimation of CN- and F-.
    Molecular Crystals and Liquid Crystals 11/2012; 566(1):61-66. DOI:10.1080/15421406.2012.701121 · 0.49 Impact Factor
  • Seon-Yeong Gwon, Eun-Mi Lee, Sung-Hoon Kim
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    ABSTRACT: Simple hemicyanine dyes were synthesized by a classical condensation reaction. The structures of these dyes were characterized by (1)H NMR spectroscopy, elemental analysis, and FAB-Mass spectrometry. The sensing behavior of the hemicyanines towards a selection of anions was investigated by UV-vis absorption spectroscopy. These structurally simple dyes displayed a rapid response and high selectivity for cyanide ion over other common anions in the DMSO/H(2)O solution. Different sensing mechanism of the dyes to cyanide ion were confirmed by (1)H NMR studies, together with theoretical calculations based on DFT and PPP-MO methods. These dyes show no colorimetric response for other anions investigated.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 05/2012; 96:77-81. DOI:10.1016/j.saa.2012.05.018 · 2.13 Impact Factor
  • Eun-Mi Lee, Seon-Yeong Gwon, Young-A Son, Sung-Hoon Kim
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    ABSTRACT: A squarylium (SQ) dye was synthesized by the reaction between squaric acid and 2,3,3-trimethylindolenine and its anion sensing properties were investigated using absorption and emission spectroscopy. This chemosensor exhibited high selectivity for CN(-) as compared with F(-), CH(3)CO(2)(-), Br(-), H(2)PO(4)(-), Cl(-), and NO(3)(-) in acetonitrile, which was attributed to the formation of a 1:1 squarylium:CN(-) coordination complex, the formation of which was supported by the calculated geometry of the complex.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 04/2012; 95:25-8. DOI:10.1016/j.saa.2012.04.080 · 2.13 Impact Factor
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    ABSTRACT: A multi-switchable poly(NIPAM-co-SPO-co-D-π-A dye) hydrogel with a photochromic spironaphthoxazine and an electron donor-π-conjugated-electron acceptor (D-π-A) type dye was prepared by typical radical copolymerization. The low critical solution temperature (LCST) behavior was investigated by UV–vis spectroscopy, which allows the measurement of the phase transition from 20 to 40 °C in aqueous solution. The fluorescence intensity of the poly(NIPAM-co-SPO-co-D-π-A dye) was temperature-dependent. Reversible modulation of fluorescence intensity was achieved using alternating irradiation with UV and visible light. Prepared polymer hydrogel also exhibited spectra change when not only used Cu2+ cation but also an acid unit.
    Journal of Luminescence 03/2012; 132(3):665–670. DOI:10.1016/j.jlumin.2011.09.025 · 2.37 Impact Factor
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    ABSTRACT: We have investigated the Hg2+ transport from Crystal Violet Lactone to Fluoran dye based on the association constant, Kass. Upon addition of Hg2+, the Crystal Violet Lactone shows a new peak at around 603 nm, and the color of the solution changed from colorless to blue. With the addition of Fluoran dye in this solution containing Crystal Violet Lactone and Hg2+, the absorption intensity of Fluoran dye at 447 nm and 586 nm was all increased. So the color of solution gradually became black from blue color. From the changes of the ratio A586/A447, it is apparent that the Hg2+ in Crystal Violet Lactone–Hg2+ was transported to colored Fluoran. The Hg2+ transport from Crystal Violet Lactone to Fluoran dye was also carried out by the calculation of the association constant: the binding ability for the complex formation of Fluoran dye and Crystal Violet Lactone–Hg2+ is much greater in CH3CN solution (Kass = 3.0 × 104 M−1) than that of the Crystal Violet Lactone with Hg2+ (Kass = 1.2 × 103 M−1).
    Dyes and Pigments 03/2012; 92(3):1058–1061. DOI:10.1016/j.dyepig.2011.07.017 · 3.47 Impact Factor
  • Young-A Son, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A new designed colorimetric and fluorescent dye chemosensor was synthesized, characterized and computationally calculated using MO theory calculation, which was based on donor-pi-acceptor electron charge transfer system. This particularly designed dye chemosensor displayed the selective Ni2+ ion chemo-sensing effects in optical properties with absorption and fluorescence emission. This dye chemosensor represented clear absorption spectra changes with Ni2+ ion and the dramatic fluorescence quenching effect with Ni2+ ion was determined. However it showed no significant optical spectra changes upon the addition of other metal ions such as Cd2+, Na2+, Mg2+, Pb2+, Fe2+, Fe3+, Ca2+, Cu2+, Hg2+, except Zn2+.
    Journal of Nanoscience and Nanotechnology 02/2012; 12(2):1503-6. DOI:10.1166/jnn.2012.4591 · 1.34 Impact Factor
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    ABSTRACT: pH triggered dye sensor based on pyrone unit as a donor group and furan unit as an acceptor grouphave resulted in very promising optical switches, when dye was applied by alkali-induced nucleophilic additionreaction. The dye displayedclear UV-Visible absorption changes and new fluorescence emission behaviors, which are based on intramolecular charge transfer (ICT) system of the dye molecular structure. The levels of energy potential and the electron density distributions of this dye chemosensor were also simulated and discussed using computational modelcalculation.
    Fibers and Polymers 02/2012; 13(2). DOI:10.1007/s12221-012-0159-z · 1.11 Impact Factor
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    ABSTRACT: A bistable photoswitching photochromic spironaphthoxazine/isophorone-based fluorescent dye system was investigated. The photoregulated fluorescence switching behavior of a spironaphthoxazine/isophorone dye loaded poly(methyl methacrylate) nanofiber was also studied. Reversible modulation of fluorescence intensity was achieved using alternating irradiation with UV and visible light. The erasable and rewritable optical storage based on spironaphthoxazine/isophorone dye loaded poly(methyl methacrylate) nanofiber has been developed.
    Dyes and Pigments 01/2012; 92(1):542–547. DOI:10.1016/j.dyepig.2011.06.002 · 3.47 Impact Factor
  • Yu Wang, Seon-Yeong Gwon, Sheng Wang, Sung-Hoon Kim
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    ABSTRACT: A dual mode chemosensor dye 3 for detection of fluoride ion, based on the D-π-A molecular framework by one-step condensation, presents high selectivity and sensitivity both in colorimetric and fluorometric analyses. Upon the addition of F(-) anion, the absorption band shows a remarkable red shift along with fluorescent intensity decreasing. The absorption and fluorescent intensities of the dye 3 can be reversibly selected by deprotonation/protonation of the amine moiety via control of intramolecular charge transfer (ICT), leading to a molecular switch with "on" and "off" states. (1)H NMR titration analysis and DMol(3) calculation were employed to reveal the intermolecular charge transfer system of dye 3-F(-) complex.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2011; 86:294-8. DOI:10.1016/j.saa.2011.10.039 · 2.13 Impact Factor