Journal of Solution Chemistry

, Volume 43, Issue 4, pp 711–726 | Cite as

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



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·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 Δlog10 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)]+.


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 



We thank the Research Fund of Uludag University for financial support given to this research project (Project Number UAP(F)-2011/71). This study is a part of MS thesis of the first author accepted on 16 January 2013 by the Graduate School of Natural and Applied Sciences of Uludag University.


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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of Arts and SciencesUludag UniversityBursaTurkey

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