An electrochemical study on interaction of copper ions with three isomers, picolinic, nicotinic and isonicotinic acids at physiological pH

Biçer E., Tatlidil D.

RUSSIAN JOURNAL OF ELECTROCHEMISTRY, cilt.52, sa.1, ss.17-26, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52 Sayı: 1
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1134/s102319351601002x
  • Dergi Adı: RUSSIAN JOURNAL OF ELECTROCHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.17-26
  • Anahtar Kelimeler: pyridine monocarboxylic acids, copper, complex, polarography and voltammetry, HALF-WAVE POTENTIALS, SPECTRAL PROPERTIES, CRYSTAL-STRUCTURES, STABILITY-CONSTANTS, AQUEOUS-SOLUTIONS, LIGAND COMPLEXES, METAL, CU(II), VOLTAMMETRY, REDUCTION
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The electrochemical behaviors of copper ions complexed with picolinic, nicotinic and isonicotinic acids (2-, 3- and 4-pyridinecarboxylic acids) in Britton-Robinson buffer (pH 7.4) was studied by polarographic and voltammetric techniques on a mercury electrode. This study showed that the reduction of complexed copper ions in the presence of nicotinic acid (NA) was carried out in two one-electron steps [Cu(II)/Cu(I) and Cu(I)/Cu(0)] whereas this cathodic process in the presence of picolinic acid (PA) or isonicotinic acid (INA) occurred in one two-electron step [Cu(II)/Cu(0)]. The stability of the Cu(I) complex can be sourced from the positions of carboxylate substituents on these isomeric ligands, binding to the copper center.