Seon-Yeong Gwon

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (42)70.73 Total impact

  • 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). · 0.53 Impact Factor
  • Seong-Min Ji, Seon-Yeong Gwon, Sung-Hoon Kim
    Dyes and Pigments 01/2014; 108:93–97. · 3.53 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; · 1.98 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; · 1.98 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; · 1.98 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.
    Textile Coloration and Finishing. 01/2013; 25(1).
  • 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 01/2013; 25(2). · 1.55 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; · 1.98 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. · 1.98 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. · 1.98 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. · 2.14 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. · 3.53 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. · 1.15 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. · 3.53 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. · 1.98 Impact Factor
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    ABSTRACT: A novel, potential dye chemosensor based on pyrrole as a donor unit and isophorone as an acceptor unit have caused sizeable optical changes when used as a reversible, pH-induced, molecular switching in the presence of alkali/acid stimulus. The dye also exhibited marked UV-visible absorption changes and highly fluorescence quenching in the presence of fluoride anions, which are based on intramolecular charge transfer (ICT) system. The level of energy potential and the electron flowing stream of this dye chemosensor such as HOMO and LUMO values were calculated by computational calculation approaches.
    Fibers and Polymers 08/2011; 12(5):692-695. · 1.11 Impact Factor
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    ABSTRACT: A thermoresponsive poly(VCa-co-fluorophore) hydrogel labeled with fluorescent dye was prepared using conventional radical polymerization. A poly(VCa-co-fluorophore) copolymer consisting of N-vinylcaprolactam (VCa) and 2D-π-A type pyran-based fluorescent dye (fluorophore) units behaves as a temperature-driven fluorescent thermometer. This polymer in aqueous solution underwent a phase transition at 27–45 °C. The morphology of the internal microstructure of the poly(VCa-co-fluorophore) hydrogel was observed using SEM.
    Fibers and Polymers 04/2011; 12(2):288-290. · 1.11 Impact Factor
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    ABSTRACT: A colorimetric displacement assay system for F− and H2PO4− anions based on a 2,6-dichlorophenol-indo-o-cresol sodium salt:calix[4]arene-p-sulfonate complex was studied in 1:1 DMSO:water solution. When calix[4]arene-p-sulfonate formed the complex with the blue 2,6-dichlorophenol-indo-o-cresol sodium salt dye, the absorption peak of the dye at 625 nm disappeared and the DMSO:water solution of the complex was colourless. However, the initial blue colour of the dye returned with the addition of both F- and H2PO4− anions which bound to the calix[4]arene-p-sulfonate and, in doing so, displaced the 2,6-dichlorophenol-indo-o-cresol sodium salt from the 2,6-dichlorophenol-indo-o-cresol:calix[4]arene-p-sulfonate complex. The findings imply that this displacement assay could be used to develop potential optical signalling systems for the detection of anions such as F− and H2PO4−.
    Dyes and Pigments 01/2011; 88(1):84-87. · 3.53 Impact Factor
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    ABSTRACT: A thermoresponsive poly(NIPAM-co-Azo) hydrogel labeled with azo dye was prepared by typical radical copolymerization. The lower critical solution temperature (LCST) behavior was investigated by means of UV-vis spectroscopy which allows the measurement of the phase transition from 25 to 45 °C in aqueous solution. The poly(NIPAM-co-Azo) copolymer also exhibited sizeable color change when used a acid/base-induced molecular switch. This material can act as water soluble dual sensor for both temperature and acid/base.
    Fibers and Polymers 01/2011; 12(1):142-144. · 1.11 Impact Factor
  • Young-A Son, Seon-Yeong Gwon, Sung-Hoon Kim
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    ABSTRACT: A novel chromogenic and fluorogenic dye chemosensor was computationally designed using MO theory calculation and synthesized based on donor-π-acceptor unit. This prepared dye sensor showed the selective Ni2+ metal ion sensing effects in optical properties with UV-vis absorption and fluorescence emission. Dye sensor displayed evident absorption changes with Ni2+ ion and highly selective fluorescence quenching effect was determined. But it showed no significant changes upon the addition of other metal ions such as Cd2+, Na2+, Mg2+, Pb2+, Fe2+, Fe3+, Ca2+, Cu2+, Hg2+ and Zn2+
    Molecular Crystals and Liquid Crystals 01/2011; 538(1). · 0.53 Impact Factor

Publication Stats

36 Citations
70.73 Total Impact Points

Institutions

  • 2009–2014
    • Kyungpook National University
      • Department of Textile System Engineering
      Daikyū, Daegu, South Korea
  • 2013
    • Korea Testing & Research Institute
      Sŏul, Seoul, South Korea
  • 2009–2012
    • Chungnam National University
      • Department of Advanced Organic Materials and Textile System Engineering
      Daiden, Daejeon, South Korea