Seon-Yeong Gwon

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (47)90.2 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: D-π-A system 3 has been designed and synthesized from 4-hydroxy benzaldehyde and isophorone. The dye 3 exhibited high selectivity for cyanide ion detection over other anions with the association constant of the dye 3-CN− complexes were found to be of 4.65×103 M−1. 1H NMR studies indicated that the cyanide ion sensing by the dye 3 is due to the formation of H-bonds between CN− ions and OH moiety of the dye 3. In the presence of CN− ion the color of dye 3 is purple. After the addition of Cu2+ ion, the purple dye 3-CN solution has been turn to yellow color with the binding constant to be 6.17×103 M−1. Besides, dye 3 has also been sense volatile organic compounds (VOCs) such as ethylamine, diethylamine and triethylamine. The order of the binding constant of dye 3 with various amines are ethylamine>diethylamine> triethylamine. The structural and electronics properties of the dye 3 and their cyanide complexes were also investigated using Material Studio 4.4 program. © 2015, The Korean Fiber Society and Springer Science+Business Media Dordrecht.
    No preview · Article · Aug 2015 · Fibers and Polymers
  • 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.
    No preview · Article · Sep 2014 · Molecular Crystals and Liquid Crystals
  • 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.
    No preview · Article · Sep 2014 · Dyes and Pigments
  • Young-A. Son · Seon-Yeong Gwon · Sung-Hoon Kim
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    ABSTRACT: We have designed and synthesized the colorimetric chemosensor through the reactions of 2-(4H-chromen-4-yildene)malonitrile and 4-imidazolecarboxaldehyde. Due to its well conjugated D-π-A system and the existence of NH- fragment in structure, we expected that the chemosensor can detect anion using NH- fragment in the imidazole moiety of the structure. In this regard, UV-Vis absorption spectra were measured to investigate sensing properties of the probe toward different anions in DMSO. This chemosensor can detect both fluoride and cyanide ion with absorption change in intensity. In addition, pH sensing property was also investigated upon the addition of hydroxide ion. These properties are related to the deprotonation effect. The ICT system in this molecule was also observed by the computational approach using Material Studio 4.3 package.
    No preview · Article · Aug 2014 · Molecular Crystals and Liquid Crystals
  • 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.
    No preview · Article · Apr 2014 · Fibers and Polymers
  • 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.
    No preview · Article · Oct 2013 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • 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(-).
    No preview · Article · Oct 2013 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • 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.
    No preview · Article · Aug 2013 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • 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.
    Preview · Article · Mar 2013
  • 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.
    No preview · Article · Feb 2013 · Supramolecular Chemistry
  • 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.
    No preview · Article · Nov 2012 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • Seon-Yeong Gwon · Sue-Yeon Lee · Young-A Son · Sung-Hoon Kim
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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. © 2012 The Korean Fiber Society and Springer Science+Business Media Dordrecht.
    No preview · Article · Nov 2012 · Fibers and Polymers
  • 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.
    No preview · Article · Nov 2012 · Molecular Crystals and Liquid Crystals
  • 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-.
    No preview · Article · Nov 2012 · Molecular Crystals and Liquid Crystals
  • 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.
    No preview · Article · May 2012 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • 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.
    No preview · Article · Apr 2012 · Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • Eun-Mi Lee · Seon-Yeong Gwon · Byung-Chul Ji · Sheng Wang · Sung-Hoon Kim
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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.
    No preview · Article · Mar 2012 · Journal of Luminescence
  • Eun-Mi Lee · Seon-Yeong Gwon · Byung-Chul Ji · Sung-Hoon Kim
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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).
    No preview · Article · Mar 2012 · Dyes and Pigments
  • [Show abstract] [Hide abstract]
    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.
    No preview · Article · Feb 2012 · Fibers and Polymers
  • 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+.
    No preview · Article · Feb 2012 · Journal of Nanoscience and Nanotechnology

Publication Stats

239 Citations
90.20 Total Impact Points

Institutions

  • 2009-2014
    • Kyungpook National University
      • • Department of Textile System Engineering
      • • School of Materials Science and Engineering
      Daikyū, Daegu, South Korea
  • 2011
    • Chungnam National University
      • Department of Advanced Organic Materials and Textile System Engineering
      Daiden, Daejeon, South Korea