Determination of the Formation Constant of Some Transition Metal Ion- histidine Complexes in Water and Water-dioxane and Evaluation of their Thermodynamic Parameters
Ebrahim Ghiamati, Ehsaneh Jalaeian
Asian Journal of Physical and Chemical Sciences · pp. 1–10 · Published 1 Jun 2017
10.9734/AJOPACS/2017/34102Abstract
Aims: The formation constants of histidine complexes of Fe (III), Co (II), Ni (II), Cu(II), Zn (II) and Pb (II) at temperatures of 25, 30, 37, 45°C were determined potentiometrically, utilizing modified Bjerrum's method. Potentiometric titrations were carried out in 30% and 70% (v/v); 50% and 50% (v/v) water-dioxane mixtures. Ionic strength of medium was retained at 0.10 M by sodium nitrate. The first and second formation constants were obtained by plotting corrected pH versus concentration of standardized NaOH solution after each addition. Results: The trend for increasing stability in both aqueous solution and in dioxane-water mixtures is as follows: kf pb(II)-His < kf Co (II)-His < kf Zn (II)-His < kf Ni(II)-His < kf Cu(II)-His < kf Fe(III)-His The effects of dioxane and temperature on the formation constants of histidine complexes were examined. Our findings showed that the formation constants of the complexes increased as the dioxane content was raised. The negative values of ΔG° are indication of the spontaneity of the reactions. ΔH° values are positive conveying the complex formation is an endothermic process. Conclusion: The variations in log of formation constants versus 1/T is linear evidencing that ΔH°s are independent of temperature in temperature range of the study, and increase in entropy are cause of formation of these complexes.
References (21)
- 1 637. The stability of transition-metal complexes [DOI]
- 2 The relative affinities of ligand atoms for acceptor molecules and ions [DOI]
- 3 Metal Complexes in Aqueous Solutions [DOI]
- 4 The Determination and Use of Stability Constants [DOI]
- 5 The saga of copper(II)–l-histidine [DOI]
- 6 Metal Ions in Biological Systems [DOI]
- 7 Chemistry of complex equilibria [DOI]
- 8 Chemistry of Complex Equilibria [DOI]
- 9 Critical survey of formation constants of complexes of histidine, phenylalanine, tyrosine, L-DOPA and tryptophan [DOI]
- 10 Phenylalanine transport at the human blood-brain barrier. Studies with isolated human brain capillaries. [DOI]
- 11 Reversion of hypertrophic cardiomyopathy in a patient with deficiency of the mitochondrial copper binding protein Sco2: Is there a potential effect of copper? [DOI]
- 12 Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation [DOI]
- 13 A study of the effect of amino acid structure on the stabilities of the complexes formed with metals of group II of the periodic classification [DOI]
- 14 Prediction of stability constants. II. Metal chelates of natural alkyl amino acids and their synthetic analogs [DOI]
- 15 Binary and ternary complexes of Cd(II) involving triethylenetetramine and selected amino acids and DNA units [DOI]
- 16 Potentiometric and spectroscopic study of mixed copper(II) complexes with amino acids and either adenosine 5′ triphosphate or phosphocreatine [DOI]
- 17 Thermodynamic studies on the interaction between some amino acids with some rare earth metal ions in aqueous solutions [DOI]
- 18 Complexes of vanadium(III) with aromatic amino acids and l-proline in aqueous solution [DOI]
- 19 Thermodynamic Studies on the Interaction between Phenylalanine with Some Divalent Metal Ions in Water and Water-Dioxane Mixtures [DOI]
- 20 An over View of Potentiometric Determination of Stability Constants of Metal Complexes
- 21 Effect of Dielectric constants of Dioxane-Water mixtures on Proton-Ligand Dissociation constants (pK) and formation Constants of Cu (II) complexes with 1, 3-Diphenyl Thiazines pH-metrically at 0.1M ionic strength
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