Oxidative Cleavage of S-S Bond During the Reduction of Tris(pyridine-2-carboxylato)manganese(III) by Dithionite in Sodium Picolinate-Picolinic Acid Buffer Medium
| Autor: | Nandini Bhattacharjee, Biswajit Pal, Kalyan Kali Sen Gupta |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Tris
Sodium Organic Chemistry Inorganic chemistry chemistry.chemical_element Manganese Picolinic acid 010402 general chemistry 010403 inorganic & nuclear chemistry Dithionite 01 natural sciences Biochemistry Medicinal chemistry 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Pyridine Physical and Theoretical Chemistry Stoichiometry Bond cleavage |
| Zdroj: | International Journal of Chemical Kinetics. 48:635-643 |
| ISSN: | 0538-8066 |
| DOI: | 10.1002/kin.21022 |
| Popis: | The reduction of tris(pyridine-2-carboxylato)manganese(III) by dithionite has been investigated within the temperature window 288–303 K and at pH range 5.22–6.10 in sodium picolinate–picolinic acid buffer medium. The reaction obeys the following stoichiometry: S2O42−+2 Mn III +2H2O→2 HSO 3−+2 Mn II +2H+ The reaction is described in terms of a mechanism that involves an initial complex formation between S2O42− and [MnIII(C5H4NCO2)3] followed by S–S bond cleavage to give 2HSO3− and [MnII(C5H4NCO2)2(H2O)2] as the products via the formation of SO2●− radical anion. Kinetics and spectrophotometric evidences are cited in favor of the suggested mechanism. Thermodynamic parameters associated with the equilibrium step and the activation parameters with the rate-determining step have been computed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |