Usage of thiocyanate-based ionic liquid as new optical sensor reagent: Absorption and emission based selective determination of Fe (III) ions

Coldur M., Oğuzlar S., Zeyrek Ongun M., Öter Ö., Yıldırım S.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.224, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 224
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.saa.2019.117385
  • Dergi Adı: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, Chimica, Compendex, EMBASE, INSPEC, MEDLINE, Veterinary Science Database
  • Anahtar Kelimeler: Spectrophotometry, Spectrofluorometry, Iron determination, Ionic liquid, [BMIM][SCN], WAVELENGTH-DEPENDENT FLUORESCENCE, DIPOLAR MOLECULES, IRON IONS, EXTRACTION, IRON(III), BEHAVIOR, FE(II), 1,10-PHENANTHROLINE, TRANSPARENT, COMPLEXES
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

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.