Thermodynamic Study on the Interaction Between Tl(I) Ion and L-Alanine
M. AGHAIE†, F. KESHAVARZ REZAEI‡, K. ZARE§†† and H. AGHAIE*

Department of Chemistry, Science & Research Campus, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran E-mail: hn_aghaie@yahoo.com

†Department of Chemistry, North Tehran Branch, Islamic Azad University,Tehran, Iran.

‡Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran.

§Department of Chemistry, Science & Research Campus, Islamic Azad University, Tehran, Iran.

††Department of Chemistry, Shahid Beheshti University, Evin, Tehran, Iran.

Abstract

The formation constant of interaction of Tl(I) ion with L-alanine was experimentally studied at pH = 4.1 ± 0.01 (50 mM of potassium hydrogen phthalate buffer), ionic strength of 0.1 M potassium nitrate at 5 different temperatures 15, 20, 25, 30 and 35 °C by UV-Vis spectrophotometric method. The optical absorption spectra of mixtures containing considered cation and L-alanine were analyzed by using SQUAD software, in order to obtain the formation constant and the stoichiometry of respect complex. The best fitting of present results showed that the 1:1 complex in respect to the studied system (Tl+(aq) + L-alanine) is formed. Regarding the values of formation constant at different temperatures and using Van’t Hoff equation, it is possible to calculate the respective thermodynamic functions of formation such as ΔG°, ΔH°, ΔS° of the studied complex.
Keywords

L-Alanine, Tl(I) complex, Thermodynamic parameters.
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  • Asian J. Chem. /
  •  2010 /
  •  22(2) /
  •  pp 959-964