thermodynamic study on the interaction between fe2+(aq) ion and lalanine

using uv-vis spectrophotometric method, the formation constant for interaction of fe2+(aq) ion with l-alaninewas experimentally studied at ph = 4.1 ± 0.01 (50mm of potassium hydrogen phthalate buffer), ionic strengthof 0.1m potassium nitrate and at 5 different temperatures 15,20, 25,30 and 35 t. the optical absorption spectraof mixtures containing considered cation and l-alanine were analyzed by using squad software, in order toobtain the formation constant and the stoichiometry of respect complex. the best fitting of our results showedthe 1:2 complex respect to the studied system (fe2+00 + l-alanine) is formed. regarding the value of formationconstants at different temperatures and using van' t hoff equation, it is possible to calculate the respectivethermodynamic functions of formation such as ag', an' , as', ... of the studied complex.