Dong-Soo Shin

Changwon National University, Changnyeong, South Gyeongsang, South Korea

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Publications (88)119.83 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This piece of work outlines a novel approach towards the synthesis of an efficient yellow emitting Sr0.975Ca0.975Eu0.05SiO4 phosphor imbibed with the sufficient red spectral components. This teleportation was achieved by the fidelity of the well-known silicate source namely, mesoporous silica. The findings showed a broad emission of the synthesized phosphor, from blue to red along with a stable emission color till 450 K and emission decay time of 1 μs. When the phosphor is fabricated with ultra-violet (400 nm) and blue LED (450 nm) chips, it promisingly harnessed warm-white light with correlated color temperature < 4000 K, and color rendering index > 80.
    Journal of Materials Chemistry 06/2014; · 5.97 Impact Factor
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    ABSTRACT: A successful method has been demonstrated for the synthesis of mesoporous organic-inorganic nanohybrid using amine functionalized polyhedral oligomericsilsesquioxane (POSS) and pluronic polymer as silica precursor and structure directing agent, respectively. The results confirmed the presence of porous structure, along with the high surface area and uniform pore size distribution which can be utilized for various applications namely catalysis, drug-delivery etc.
    New Journal of Chemistry 03/2014; · 2.97 Impact Factor
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    ABSTRACT: Perfluorooctanesulfonate (PFOS) is a compound of global concern because of its persistence and bioaccumulation in the environment. Nevertheless, little is known of the potential for PFOS biodegradation, even though the importance of characterizing the function and activity of microbial populations detected in the environment has been discussed. This study focused on the biodegradation of PFOS by a specific microorganism. Through this study, we have identified the aerobic microorganism for the specific decomposition of PFOS from wastewater treatment sludge, as a well-known sink for environmental PFOS. This species was Pseudomonas aeruginosa strain HJ4 with a 99% similarity, a mesophilic rod type bacteria (30-37°C). A pH range of 7-9 was determined to be optimal for the growth of strain HJ4. In this study approximately 67% over a range of concentrations (1400-1800μgL(-)(1)) for PFOS was biologically decomposed by P. aeruginosa after 48h incubation. This result is reported here for the first time, which strongly pertains to the efficient biodegradation of PFOS. Therefore, our study is considered a major advancement in sustainable PFOS treatment.
    Chemosphere 02/2014; · 3.14 Impact Factor
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    ABSTRACT: Design and synthesis of hemi fluorinated perfluorooctanesulfonic acid (PFOS) alternatives was described using a Zn/CuI mediated Michael-type addition 10 reaction in ionic liquids considering environmentally benign reaction conditions as well as products. One of the new potassium sulfonates showed promising surface tension activities when compared to that of PFOS potassium salt.
    Green Chemistry 01/2014; · 6.83 Impact Factor
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    ABSTRACT: A series of benzofuran-2-carboxamides of biological and medicinal significance were synthesized by a microwave-assisted one-pot parallel approach via O-alkylation/Knoevenagel condensation. All the compounds were characterized and assayed for their in vivo anti-inflammatory, analgesic and antipyretic activities. The activity data of all compounds were listed and discussed in detail, among which some derivatives exhibited potent activities of particular interest.
    Tetrahedron Letters 01/2014; 55(17):2796–2800. · 2.40 Impact Factor
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    ABSTRACT: Perfluorobutyl substituted disodium alkanesulfonates derivatives were synthesized and characterized as alternative substances to perfluorooctanesulfonic acid (PFOS, 1), a well known surfactant. 1H,1H,2H,2H-nonafluorohexyl iodide, diethyl malonate and sultones were used to prepare disodium sulfonates 2 and 3 in three synthetic steps. The surface tension behavior of 2 and 3 were studied and critical micelle concentration values were noted to be 2025 mg/L and 2052 mg/L respectively at room temperature.
    Journal of Fluorine Chemistry 01/2014; · 1.94 Impact Factor
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    ABSTRACT: Aminoquinolines and their derivatives are important chemical entities that are widely used as pro-drugs and drugs due to their antimicrobial, cytotoxic and anti-malarial activities etc. 1 Among which, N-alkyl/aryl-6-aminoquino-lines attracted the interest of medicinal chemists because of their exceptional significance as potential nootropics. 2 Bio-chemical studies have shown that these compounds possess good acetyl-cholinesterase inhibitor (AChEI) activity. N-Substituted-6-aminoquinoline has been considered as new lead compound for the discovery of memory and cognition facilitating drugs. Synthetic efforts to attain the 6-amino quinoline (I) based biologically active structures have been studied including the parent compound which itself is a fluorophore (acts as a probe in metabolite identification). 3 Generally, N-substituted-6-aminoquinolines can be obtained by using sodium borohydride to reduce the Schiff's base prepared by condensation of 6-aminoquinoline with differ-ent aldehydes. 4-7 Another method is the palladium-catalyzed C-N coupling between amines and 6-halogenated (or 6-sulfonyl) quinolines. 8-10 However, all of them have some limitation with respect to expensive starting materials and long reaction times. For example, aldehydes are highly reactive, not stable for air and absent in diversity. Although phenols are diverse to be used in laboratory for amine synthesis, palladium-catalyzed method has serious problems with respect to cost and presence of residual palladium. The lack of an efficient method to facile synthesis of N-sub-stituted-6-aminoquinoline derivatives attracted us to take up their preparation. In order to study the specific AChEI agents, one needs to synthesize a series of N-substituted-6-aminoquinolines by following convenient strategies that also cover economical aspects. In continuation of our efforts to develop simple and cost-effective methodologies in investigating C-N bond formation from various phenols to anilines via Smiles rear-rangement, 11 we herein wish to report a practical one-pot synthesis of N-substituted-6-aminoquinolines from 6-hydr-oxylquinolines. The amine counterparts would be N-alkyl/ aryl-2-chloroacetamide and the bases used for this reaction include Cs 2 CO 3 and/or K 2 CO 3 in DMF . 6-Hydroxylquinoline (1) is a commercial starting material to start with and very cheaper than 6-aminoquinoline. N-alkyl/aryl 2-chloroacetamides (2) can be easily prepared by acylation of amines with chloroacetylchloride and triethyl-amine in dichloromethane. The C-N coupling between com-pound 1 and 2 undergoes a tandem O-alkylation/Smiles rearrangement/hydrolysis sequence. The proposed three-step process has been illustrated in Scheme 1. The compound 1 was etherified with excess base and compound 2 to afford N-alkyl/aryl-2-(quinoline-6-yloxy)acetamide (3). This further underwent Smiles rearrangement to give the intermediate 4. Finally, hydrolysis of compound 4 yielded us the N-alkyl/ aryl-6-aminoquinolines (5). To explore the optimized conditions for this reaction we chose compound 1 and N-benzyl-2-chloroacetamide (2a) as phenol and amine counterparts and the results are repre-sented in Table 1. It was found that the compound 1 reacted with 1.2 equiv of 2a in the presence of Cs 2 CO 3 in DMF, afforded 5a after 2 h at 150 o C in 68% yield. Changing base from Cs 2 CO 3 to K 2 CO 3 or Na 2 CO 3 sharply decreased the reaction yields (Table 1, Entry 2 & 3). We have recently established our refurbish results for obtaining arylamines using Smiles rearrangement in presence of K 2 CO 3 and cata-lytic KI as a better regent system, from phenols (which have Scheme 1. The three-step one-pot process.
    Bulletin of the Korean Chemical Society 12/2013; 34(12):3881. · 0.98 Impact Factor
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    ABSTRACT: A simple post-co-precipitation strategy is adopted for the construction of mesoporous silica frame work in which the rare earth gadolinium oxide (Gd2O3:Eu3+& Gd2O3:Sm3+,Eu3+) is incorporated as an emissive probe for optical and bio-medical applications. The samples show good emission along with the required theranostic properties. Under blue region, a better red emissive behavior is observed in the case of Eu3+ doped sample while the Sm3+ and Eu3+ co-doped sample exhibit the same under the near ultra-violet region. Moreover, the structural and textural properties of mesoporous silica are preserved even in the presence of rare earth groups doped of Gd2O3 and this can very well be utilized for theranostic applications. A clear confocal microscopy image shows a red spot, and thus its potential towards trackability is confirmed. In addition to this, other admirable properties are also associated with it namely, an excellent drug loading ability, bio-compatibility, easy surface modification by the targeting moiety and excellent longitudinal relaxivity (T1) under magnetic resonance imaging (MRI), which stands par for it to be utilized in the field of theranostics too. This material shows a good luminescence property along with the desired internal-external morphology& a narrowly ordered porosity can validate the application of these materials in multi-faceted fields such as phosphors for LEDs, bio-imaging, theranostics etc.,
    RSC Advances 12/2013; · 2.56 Impact Factor
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    ABSTRACT: A rare-earth metal ion (Eu3+) doped ZnO nanocomposites have been successfully synthesized by employing wet chemical procedure using multi-wall carbon nanotubes (MWCNT's) as removable template. The preparation was carried out by immersing empty and dried MWCNT's in a stoichiometric composition of zinc nitrate and europium nitrate solution followed by filtration and sintering. The synthesized Eu3+ doped ZnO nanocomposites were characterized by means of different characterization techniques namely XRD, SEM, EDS, FT-IR and Raman spectroscopy. The XRD profile of the Eu3+ doped ZnO nanocomposites indicated its hexagonal nature while the photoluminescent analysis reveals that the prepared nanocomposite exhibits a strong red emission peak at 619 nm due to 5D0 --> 7F2 forced electric dipole transition of Eu3+ ions. Such luminescent materials are expected to find potential applications in display devices.
    Journal of Nanoscience and Nanotechnology 11/2013; 13(11):7680-4. · 1.15 Impact Factor
  • Thin Solid Films 11/2013; · 1.60 Impact Factor
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    ABSTRACT: Porphyrin-POSS hybrid: Porphyrin-POSS molecular hybrid composites (see scheme; POSS = polyhedral oligomeric silsesquioxanes) were synthesized and structurally characterized, allowing the realization of truly homogenous dispersion of basic functional building blocks between organic and inorganic components at the molecular level. These materials allow the optimization of aggregation/association behavior and thus the functional optical properties of the porphyrinato zinc compounds.
    Chemistry 09/2013; 19(38):12613-8. · 5.93 Impact Factor
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    ABSTRACT: Eu3+ activated NaSr(P,V)O4 phosphors have been synthesized using solid state reaction method and further characterized for their structure and optical properties using different techniques such as X-ray diffraction, scanning electron microscopy, photolumniscenec excitation, emission, and chromaticity coorrdinate analysis, etc. Material shows a broad excitation peak (monitored for lambda(ems) = 613 nm) lying in the 300-360 nm region and gives intense transitions (lambda(exc) = 320 nm) namely 5D0 --> 7F1 at 590 nm, 5D0 --> 7F2 at 613 nm, 5D0 --> 7F3 at 650 nm, and 5D0 --> 7F4 at 700 nm due to Eu3+ ion. Our results show that replacement of the PO4(3-) ions with isomorphic VO4(3-) ions improves the structural stability and the overall intensity of the emission. The maxium emission intensity is achieved for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor. An estimated increase of an order is attained for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor as compared to NaSrPO4:Eu3+ or NaSrVO4:Eu3+ phosphor. The chromaticity coordinate of the phosphor (0.68, 0.31) lies well within the red region and suggest that the material could be an alternative red phosphor for lighting and display applications.
    Journal of Nanoscience and Nanotechnology 08/2013; 13(8):5552-5. · 1.15 Impact Factor
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    ABSTRACT: Al contents have been doped as a sensitizer to improve the luminescent brightness, and the conventional solid state reaction method has been used to synthesize the phosphors. Al doping effects on the microstructures of YVO4:Eu3+ phosphors were measured by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The luminescent characteristics were characterized by photoluminescence excitation (PLE) and emission (PL) measurements. Incorporation of Al3+ ions into the YVO4:Eu phosphors has greatly enhanced the crystallinity, particle size and hence the luminescence properties and the optimum concentration in Al dopants are found to be 0.05 mol. The photoluminescence intensity of 0.05 mol Al(3+)-doped YVO4:Eu3+ phosphors was improved by a factor of 1.41, in comparison with undoped Y0.95Eu0.05VO4 phosphor. The improvement in photoluminescence properties with Al doping may result from the improved crystallinity and from the enlarged grain sizes inducing lower scattering loss.
    Journal of Nanoscience and Nanotechnology 08/2013; 13(8):5636-9. · 1.15 Impact Factor
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    ABSTRACT: In this present work, we have developed a novel POSS type monomer ligand “2,6-pyridinediamine-bis-(propanylheptaisobutyl POSS)” (PDC-POSS) and utilized in the preparation of potential luminescent hybrid complex Eu-PDC-POSS with an inner transition metal ion Eu3+. The solubility and photo-emitting properties of new Eu-PDC-POSS hybrid material were studied. The precursor PDC-POSS was synthesized by treating (3-aminopropyl)heptaisobutyl POSS with PDC (2,6-pyridinedicarboxylic acid chloride), and then coordinated with Eu3+ using europium nitrate to afford Eu-PDC-POSS hybrid material. The europium-doped hybrid material was characterized using fourier transform infrared spectroscopy, and scanning electron microscopy along with energy dispersive X-ray analysis. The photo emitting properties were studied using a fluorescence spectrophotometer in which, the results showed enhancement in red emission peak at 618 nm for Eu-PDC-POSS, when compared to that of a known solgel-based material Eu-PDC-solgel.
    Journal of Materials Science 07/2013; · 2.16 Impact Factor
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    ABSTRACT: The present investigation aims to demonstrate the potentiality of Eu3+/Sm3+ single-doped and co-doped Ca4YO(BO3)3 phosphors, which were prepared by a sol–gel method. The X-ray diffraction (XRD) profiles showed that all the observed peaks could be attributed to the monoclinic phase of Ca4YO(BO3)3. From the measured emission profiles, we have noticed that both the single-doped Eu3+/Sm3+ phosphors shows four emission transitions of 5D0 → 7F0,1,2,3 and 4G5/2 → 6H5/2,7/2,9/2,11/2 respectively. Among them, the 5D0 → 7F2 of Eu3+ and 4G5/2 → 6H7/2 of Sm3+ are intense emission transitions, leading to an intense red color emission from the prepared phosphors. The excitation spectra showed that Eu3+/Sm3+ doped samples can be excited efficiently by 394 nm and 402 nm respectively, incidentally which matches well with the characteristic emission from UVLED. The co-doping of Sm3+ ions can broaden and strengthen the absorption of near UV region and to be efficient to sensitize the emission of the Ca4YO(BO3)3:Eu3+ phosphor. The mechanism involved in the energy transfer between Eu3+ and Sm3+ has been explained and elucidated by an energy level diagram.
    Materials Chemistry and Physics. 07/2013; 140(s 2–3):453–457.
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    ABSTRACT: A convenient one-pot synthesis of phenols to anilines using 2-chloroacetamide/K2CO3/DMF system catalyzed by KI via Smiles rearrangement has been described. The synthesis of extensive amino aromatic products from phenols containing electron withdrawing group, has been performed in moderate to excellent yields to demonstrate the potentiality of this method in bio-medicinal and pharmaceutical applications.
    Tetrahedron Letters 06/2013; · 2.40 Impact Factor
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    ABSTRACT: Eu3+ doped and Eu3+, Yb3+ co-doped Gd3Ga5O12 phosphors have been developed by facile solid state reaction method which can be easily scaled-up in large quantity. The synthesis has been optimized to get a single phase material at 1300 °C. The phase and crystal parameters have been analyzed by using X-ray diffraction measurement. Photoluminescence excitation (monitored for the 5D0 → 7F1 transition of Eu3+) depicts that the active ion (Eu3+) can be excited through direct excitation into 4f band of Eu3+, through charge transfer band (Eu3+-O2−) excitation and also through the excitation into 8S7/2 → 6IJ intra f–f transition of Gd3+ ion, which significantly all together cover a broad excitation region in 200–420 nm. In addition, in the presence of Yb3+ ions, the emission is also achieved by near infrared excitation (976 nm), through a typical upconversion (UC) process. Thus, the material efficiently behaves as a dual mode emitting phosphor (emission is achieved both through normal fluorescence and through UC process). The conversion efficiency of silicon solar cells is only 15% of terrestrial solar energy for 200–400 nm region and also the sub-band gap energy (in infrared region) is lost as heat; therefore, this kind of dual mode phosphors may be used to overcome the above mentioned incomplete utilization of the solar spectrum and can open realm of new possibilities for energy harvesting.
    Journal of Applied Physics 05/2013; 113(17). · 2.21 Impact Factor
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    ABSTRACT: Eu3+ doped K2La2Ti3O10 (KLT) phosphors were prepared by means of conventional solid state reaction method. It has exhibited an intense excitation band at around 466 nm, which matches well to the popular emission line from a GaN based blue light-emitting diode (LED) chip. Using this as an excitation wavelength the Eu3+ doped KLT phosphors yielded two strong orange-red emission bands at 595 nm (5D0→7F1) and 616 nm (5D0→7F2) respectively. The obtained results suggest that Eu3+doped KLT phosphors are useful for blue chip white LEDs. Besides we have studied its dielectric properties along with the other significant characterizations like XRD, SEM and Tg-DTA.
    Optics Communications 05/2013; 294:208–212. · 1.44 Impact Factor
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    ABSTRACT: Efficient and green syntheses of heterocycles are of great importance. In this work, we have demonstrated the synthesis of benzo[d]thiazoles and benzo[d]oxazoles using 2-acylpyridazin-3(2H)-ones as acyl transfer agents under transition-metal-free and eco-friendly conditions. It is worthy to note that the reaction is efficient, green, and economical, and will find several applications in organic synthesis, medicinal chemistry, and industrial chemistry.
    Tetrahedron. 04/2013; 69(17):3530–3535.
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    ABSTRACT: An efficient process for the synthesis of N-azaaryl anilines via Smiles rearrangement as a tool. A variety of Nazaaryl anilines were generated by the reaction of substituted phenols, substituted anilines, aminopyridines and chloroacetyl chloride or pyridols, under base condition in good to excellent yields.
    Bulletin of the Korean Chemical Society 02/2013; 34(2):394-398. · 0.98 Impact Factor

Publication Stats

206 Citations
119.83 Total Impact Points

Institutions

  • 1999–2014
    • Changwon National University
      • • Department of Chemistry
      • • Department of Physics
      Changnyeong, South Gyeongsang, South Korea
  • 2006–2010
    • Shandong University
      • Institute of Organic Chemistry
      Jinan, Shandong Sheng, China
  • 1994
    • University of North Texas at Dallas
      Dallas, Texas, United States
  • 1988–1994
    • University of Texas Southwestern Medical Center
      • Department of Molecular Genetics
      Dallas, Texas, United States