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Details for article 36 of 73 found articles
| Title: |
Oxygenated Cobalt Complexes with Simple Tetraazamacrocyclic Ligands |
| Author: |
Yatsimirskii, K. B. Bratushko, Yulia I. Kondratjuk, A. B. |
| Appeared in: |
Journal of coordination chemistry |
| Paging: | Volume 23 (1991) nr. 1-4 pages 335-343 |
| Year: |
1991-06-01 |
| Contents: |
Binuclear oxygenated cobalt complexes with 5,7,12,14-tetramethy I-1,4,8,II-tetraazacyclotetradeca-4,II -diene (Me4[14]dieneN4) and 5,7,7,12,14,14-hexamethyl-1,4,8,11 -tetraazacyclotetradeca-4,11 -diene (Me6[14]dieneN4) with axial ligands (NCO-, NCS-, NCSe-, N-3, OH-, NO-2, ON-C(CN)2-, Im) have been isolated and characterised by physical and chemical methods, including derivatography, electronic, IR and X-ray photoelectron spectroscopy, magnetic measurements and EPR. The electronic structure of the cobalt ion-dioxygen fragment conforms to the scheme Co(III)-O2-Co(III). The coordinated dioxygen species is activated owing to the transfer of an appreciable electron density to it. Irreversible oxidation in aqueous solution is illustrated by [μO2{Co(Me4[14]dieneN4)(H2O)}2](CIO4)4. Activation parameters for this process are E* = 54 ± 4 kJ mol-1 and ΔS* = -140 ± 16 J mol K-1. A possible mechanism is proposed. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 36 of 73 found articles
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