Oxygenation of cobalt(II) protoporphyrin IX dimethyl ester bound to copolymer of 4-vinylpyridine and styrene
✍ Scribed by Hiroyuki Nishide; Seiji Hata; Keiji Mihayashi; Eishun Tsuchida
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1978
- Tongue
- English
- Weight
- 341 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
The polymeric cobalt(II) porphyrin complexes were prepared from cobalt(II) protoporphyrin IX dimethyl ester(Co(II)P) and copolymers of 4‐vinylpyridine and styrene(PSP), and their binding ability of molecular oxygen was studied in toluene solution. The five‐ and six‐coordinate structure of CoP‐PSP complexes were confirmed by esr spectra. The esr parameters for the CoP‐PSP complexes were not affected by the molecular weight and the vinylpyridine‐unit content of PSP‐ligand. The 1:1 dioxygen‐Co complex was reversibly formed when the solution of CoP‐PSP was exposed to oxygen atmosphere at low temperature. While the visible spectra and esr parameters for the dioxygen complexes of CoP‐PSP were the same as those of the CoP‐pyridine complex, the equilibrium constant for the oxygen binding increased with the vinylpyridine‐unit content of the PSP‐ligand. The larger entropy change was observed for the oxygenation in the CoP‐PSP system especially, of which the vinylpyridine‐unit content was large.