1 Ocak 2020 Dergi makalesi Açık Erişim

Coldur, Muge; Oguzlar, Sibel; Ongun, Merve Zeyrek; Oter, Ozlem; Yildirim, Serdar

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        "affiliation": "Dokuz Eylul Univ, Grad Sch Nat & Appl Sci, Izmir, Turkey", 
        "name": "Coldur, Muge"
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      {
        "affiliation": "Dokuz Eylul Univ, Ctr Fabricat & Applicat Elect Mat, Izmir, Turkey", 
        "name": "Oguzlar, Sibel"
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      {
        "affiliation": "Dokuz Eylul Univ, Izmir Vocat High Sch, Chem Technol Program, Izmir, Turkey", 
        "name": "Ongun, Merve Zeyrek"
      }, 
      {
        "affiliation": "Dokuz Eylul Univ, Fac Sci, Dept Chem, Izmir, Turkey", 
        "name": "Oter, Ozlem"
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      {
        "name": "Yildirim, Serdar"
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    "description": "In this work, the ionic liquid 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) was evaluated for the first time for its probable usage as new optical sensor reagent for the determination of several metal ions. The ionic liquid exhibited a selective and sensitive response to iron ions in acidic aqueous solutions among all of the tested metal ions. The ([BMIM][SCN]) was encapsulated in ethyl cellulose (EC) matrix in the form of continuous thin films. The effect of [BMIM][SCN] concentration and pH to iron response, the fluorescence quantum yield, the absorption, emission and excitation based characteristics of the ionic liquid in presence of Fe3+ and Fe2+ ions were investigated in both EC and [BMIM][SCN]/aqueous buffer solution mixtures. As a result, the highly sensitive, selective and rapid responding optical sensor reagent which does not need any time-consuming extraction, oxidation and reduction procedures was presented for the distinguishing determination of Fe3+ and Fe2+ in both aqueous solutions and solid thin film matrix. The ionic liquid exhibited a better emission and absorption based response for Fe3+ ions when compared with the Fe2+ ions. The molar absorptivity constant in presence of ionic liquid-based SCN- was enhanced 10 times to 1.21 x 10(4) L mol(-1) cm(-1) for Fe3+ ions in the solution phase. Linear absorption and emission-based calibration graphs were obtained for a wide concentration range of 8.0 x 10(-8) -6.2 x 10(-4)M and 8.0 x 10(-8)-6.2 x 10(-5)M for Fe3+, respectively. Limit of detection (LOD) values for absorption and emission-based methods were 2.48 x 10(-5) and 2.4 x 10(-8), respectively. The reaction is instantaneous and absorbance remains stable for over 4 months. (c) 2019 Published by Elsevier B.V.", 
    "doi": "10.1016/j.saa.2019.117385", 
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    "journal": {
      "title": "SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY", 
      "volume": "224"
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    "title": "Usage of thiocyanate-based ionic liquid as new optical sensor reagent: Absorption and emission based selective determination of Fe (III) ions"
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