Abstract
Constants of the acid dissociation and complexation of L-phenylalanine (HPhe) with copper(II) ions are determined by potentiometry in aqueous ethanol solutions containing 0 to 0.7 molar fraction of alcohol. Changes in the Gibbs energy for the transfer from water to a binary solvent of L-phenylalanine, Phe− anion, and [CuPhe]+ complex are calculated. It is found that the weakening of solvation of the ligand donor groups in solvents with high ethanol contents is accompanied by an increase in the stability of [CuPhe]+ complex.
Similar content being viewed by others
References
L. D. Pettit and H. K. J. Powell, IUPAC Stability Constants Database SCUERY, ver. 5.2 (UK, 1997).
S. F. Ledenkov and V. A. Sharnin, Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol. 48(2), 12 (2005).
P. P. Korostelev, Reactives for Technical Analysis (Metallurgiya, Moscow, 1988), p. 383 [in Russian].
S. F. Ledenkov, V. A. Sharnin, and G. V. Chistyakova, Russ. Chem. Bull. 53, 758 (2004).
L. Pettit, Pure Appl. Chem. 56, 247 (1984).
B. Dey, S. Dutta, and S. Lahiri, Ind. J. Chem. A 21, 886 (1982).
S. Rondinini, P. Longhi, P. R. Mussini, and T. Mussini, Pure Appl. Chem. 59, 1693 (1987).
S. F. Ledenkov, Doctoral Dissertation in Chemistry (Ivan. State Chem. Technol. Univ., Ivanovo, 2005).
Y. Marcus, Pure Appl. Chem. 62, 899 (1990).
Y. Nozaki and C. Tanford, J. Biol. Chem. 246, 2211 (1971).
C. Kalidas, G. Hefter, and Y. Marcus, Chem. Rev. 100, 820 (2000).
A. S. Molchanov and S. F. Ledenkov, Russ. J. Gen. Chem. 80, 219 (2010).
Yu. Yu. Fadeev, V. A. Sharnin, and V. A. Shormanov, Russ. J. Inorg. Chem. 42, 1104 (1997).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © D.M. Burov, S.F. Ledenkov, V.N. Vandyshev, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 5, pp. 766–769.
Rights and permissions
About this article
Cite this article
Burov, D.M., Ledenkov, S.F. & Vandyshev, V.N. Thermodynamics of the complex formation of copper(II) with L-phenylalanine in aqueous ethanol solutions. Russ. J. Phys. Chem. 87, 752–755 (2013). https://doi.org/10.1134/S0036024413050038
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036024413050038