Metal iyonları varlığında ve yokluğunda rubeanik asitin voltametrik davranışlarının incelenmesi
The investigation of voltammetric behaviour of rubeanic acid in the presence and absence of metal ions
- Tez No: 185425
- Danışmanlar: YRD. DOÇ. DR. EMİNE COŞKUN
- Tez Türü: Yüksek Lisans
- Konular: Kimya, Chemistry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2006
- Dil: Türkçe
- Üniversite: Ondokuz Mayıs Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Kimya Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 82
Özet
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Özet (Çeviri)
ivABSTRACTTHE INVESTIGATION OF VOLTAMMETRIC BEHAVIOUR OF RUBEANICACID IN THE PRESENCE AND ABSENCE OF METAL IONSRubeanic acid (R.A.), having an important biological activity, the molecularformula of which is NH2CSCSNH2, has been an attractive compound. In addition, themolecule is used as a metal reagent at some branches of chemistry.Electrochemical behaviour of rubeanic acid was investigated with the method ofSquare Wave Voltammetry (SWV) and Cyclic Voltammetry (CV) between the pHvalues 2 and 12 using Britton Robinson Buffer. Three reduction peaks (-0.616; -0.787;-1.032 V at pH=7) originating from rubeanic acid were observed. The first peakcorresponds to the reversible electrode reaction and the second and third ones were seenbecause of the irreversible electrode reactions. The peak potential and current valueschanged with the pH values. While the pH values increased from 2 to 12, the peakpotentials of rubeanic acid shifted to linear negative values. The plot of Ep versus pHexhibited two lines corresponding to the first and second reduction peaks in the pHrange (2-12). Electrode reactions include H+ ions.The reversibility of the first peak was extremely good at pH 7. With increasing pHYDOXHVWKHFDOFXODWHG.QYDOXHVFKDQJHGin the interval (2,06-1,31). In addition to this,this peak was ascribed to the reduction of the mercury salt, occuring on the electrodesurface by the thiol form of rubeanic acid with Hg (II). The other peaks were thought tobe coming from the reduction of thione groups at the molecule.Moreover, the interaction of rubeanic acid with Cd(II), Zn(II) and Co(II) ions werestudied. As a result of the interaction of Cd(II) or Zn(II) ions with rubeanic acid, thepeaks which could be attributed to the complexes were observed. On the other hand, inthe presence of Co(II) and rubeanic acid, the catalytic hydrogen wave was alsoobserved.
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