Thermodynamic and Kinetic Studies on the Iron(III)-Hydroxamate Interaction in Acid Media
| Autor: | Prabir K. Das, Samir Gopal Bhattacharya, Debabrata Banerjea, Rupendranath Banerjee |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Aqueous solution
medicine.diagnostic_test Stereochemistry Chemistry Kinetics Medicinal chemistry Dissociation (chemistry) Ion chemistry.chemical_compound Reaction rate constant Spectrophotometry Materials Chemistry medicine Qualitative inorganic analysis Perchloric acid Physical and Theoretical Chemistry |
| Zdroj: | Journal of Coordination Chemistry. 19:311-320 |
| ISSN: | 1029-0389 0095-8972 |
| DOI: | 10.1080/00958978909408834 |
| Popis: | Thermodynamics and kinetics of 1:1 complexation of iron(III) with benzo- and several ortho-substituted (CH3, NH2, Cl and OH) benzohydroxamic acids (HL) forming FeL2+ have been investigated spectropho-tometrically in aqueous perchloric acid solution. Under the experimental conditions ([H+] « TFc « THL) complexation involves reactions of HL with Fe3+ (k1 path) and FeOH2+ (k2 path) ions leading to an equilibrium. Both k1 and k2 have been evaluated by stopped-flow spectrophotometry following the formation of FeL2+ and the dissociation of FeL2+ in acid solution. The AH* value (42.5 ± 4.8 Hmol-1) for the k2 path is close to that for the water exchange of FeOH2+ species, suggesting essentially a dissociative (Id) process, but that (54.5 + 3.8 kJmol-1) corresponding to the k1 path is perceptibly lower than that for the water exchange of Fe3+ species indicating associative (Ia) character. The reverse rate constants (k-1 and k_2) for the dissociation of the complexes by the two paths have also been evaluat... |
| Databáze: | OpenAIRE |
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