Abstract
The catalytic autoxidation of hydrogensulfite (hydrogen-trioxosulfate(1-)) in the presence of Co(tim)(H2O)22+ (tim = 2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene) was studied. Dioxygen reacts with excess sulfite in the presence of Co(tim)(H2O)22+ in a complex process (a minimum of five kinetic steps can be identified) to produce Co(tim)(SO3)x(3-2x)+ (x = 1 or 2) (λmax at 350 nm) and sulfate. Seventy turnovers over 4 h were attained in a system where dioxygen and sulfite were supplied constantly. The Co(III) product formed reacts only slowly with dioxygen to produce sulfate. A mechanistic analysis of the results implies the involvement of a Co(tim)-dioxygen adduct, stabilized by an axial sulfite ligand.
| Original language | English |
|---|---|
| Pages (from-to) | 221-229 |
| Number of pages | 9 |
| Journal | Supramolecular Chemistry |
| Volume | 14 |
| Issue number | 2-3 |
| DOIs | |
| State | Published - 2002 |
| Externally published | Yes |
Bibliographical note
Funding Information:This study was supported in part by a grant from the Budgeting and Planning Committee of The Council of Higher Education and the Israel Atomic Energy Commission. D. M. wishes to express his thanks to Mrs Irene Evens for her ongoing interest and support.
Funding
This study was supported in part by a grant from the Budgeting and Planning Committee of The Council of Higher Education and the Israel Atomic Energy Commission. D. M. wishes to express his thanks to Mrs Irene Evens for her ongoing interest and support.
| Funders | Funder number |
|---|---|
| Planning and Budgeting Committee of the Council for Higher Education of Israel | |
| Israel Atomic Energy Commission |
Keywords
- Catalyzed autoxidation
- Cobalt complexes
- Dioxygen
- Sulfite (hydrogentrioxosulfate(1-))