Stabilities of the Ternary Complexes of Copper(II) with Substituted 1,10-Phenanthrolines and Some Amino Acids in Aqueous Solution

Inci D., AYDIN R.

JOURNAL OF SOLUTION CHEMISTRY, cilt.43, sa.4, ss.711-726, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 4
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1007/s10953-014-0157-4
  • Dergi Adı: JOURNAL OF SOLUTION CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.711-726
  • Anahtar Kelimeler: Copper(II), 1,10-Phenanthroline, 4,7-Dimethyl-1,10-phenanthroline, 5-Nitro-1,10-phenanthroline, L-Amino acids, L-Phenylalanine, L-Tyrosine, L-Tryptophan, Stability constants, Potentiometric methods, DIOXAN-WATER MIXTURES, PROTONATION CONSTANTS, IONIC STRENGTHS, EQUILIBRIUM, LIGANDS, NI(II), CU(II), THERMODYNAMICS, LANTHANUM(III), NORADRENALINE
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

In this study the binary and ternary complexes of copper(II) with substituted 1,10-phenanthrolines [s-phen: 1,10-phenanthroline (phen), 4,7-dimethyl-1,10-phenanthroline (dmphen) and 5-nitro-1,10-phenanthroline (nphen)] and l-amino acids [aa: l-phenylalanine (phe), l-tyrosine (tyr) and l-tryptophan (trp)] have been investigated using potentiometric methods in 0.1 mol center dot L-1 KCl aqueous ionic media at 298.2 K. The protonation constants of the ligands and the stability constants of the binary and ternary complexes of Cu(II) with the ligands were calculated from the potentiometric data using the "BEST" software package. It was inferred that the aromatic 1,10-phenanthrolines act as a primary ligand in the ternary complexes, while the oxygen and nitrogen donor-containing amino acids are secondary ligands. The observed values of Delta log(10) K indicate that the ternary complexes are more stable than the binary ones, suggesting no interaction takes place between the ligands in the ternary complexes. The magnitudes of the measured stability constants of all of the ternary complexes are in the order [Cu(s-phen)(trp)](+) > [Cu(s-phen)(tyr)](+) > [Cu(s-phen)(phe)](+), which is identical to the sequence found for the binary complexes of Cu(II) with the amino acids. When the substituted 1,10-phenanthroline is changed, the stability constants of the ternary complexes decrease in the following order: [Cu(dmphen)(aa)](+) > [Cu(phen)(aa)](+) > [Cu(nphen)(aa)](+).