Potentiometric and Spectrophotometric Determination of the Stability Constants of Quercetin Complexes with Aluminium III and Iron II


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Erdoğan G. , Karadağ R., Emre D.

Reviews In Analytical Chemistry, cilt.24, ss.247-261, 2005 (SCI Expanded İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 24 Konu: 4
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1515/revac.2005.24.4.247
  • Dergi Adı: Reviews In Analytical Chemistry
  • Sayfa Sayıları: ss.247-261

Özet

Abstract: In this study, the stability constants of the complexes of quercetin formed with aluminium(III) and iron(II) were determined potentiometrically by using Calvin-Bjerrum and Irving Rossotti methods and by spectrophotometric way. The evaluated protonation constants of the ligand were found: logK1=9.630.11and logK2 = 8.32013, at the 25°C. For the aluminium and iron complexes logarithms of the stability constants were found: for Al : logK1=14.050.09 , logK2=10.020.12, and for Iron: logK1=9.440.11, logK2=3.860.08. Key words:quercetin, aluminium, iron, stability constant, potentiometri, spectrophotometri