Ein Kobalt(II)-Corrin-Komplex als reversibler Sauerstoffträger. Eine ESR.-spektroskopische Untersuchung
✍ Scribed by A. von Zelewsky
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- German
- Weight
- 374 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The diamagnetic crystalline Jodo‐Co(II)‐cobyrinicacid‐heptamethylester dissolves in benzene or toluene forming solutions which contain the monomeric paramagnetic complex unit. From anisotropic ESR.‐parameters, measured in frozen solutions, follows a ground state configuration (d~xz~,d~yz~)^4^(d~xy~)^2^(d~z~^2^)^1^ for the Co(II). The unpaired electron is highly delocalized to the axially coordinated iodide ion, giving rise to a strong hyperfine coupling with the iodine nucleus. The complex forms in a very fast and completely reversible reaction a 1:1 adduct with molecular oxygen in toluene solutions below ca. 280° K. ESR.‐parameters of the oxygen adduct are presented and discussed. Thermodynamic data for the formation reaction of the adduct are estimated.