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Photo‐reversible oxygen binding of a cobalt schiff‐base complex with an axially coordinating photo‐isomerizable polymer ligand
Author(s) -
Suzuki Takayuki,
Suzuki Yosuke,
Hachisu Kiyozumi,
Shinozaki Hiraku
Publication year - 2011
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1920
Subject(s) - isomerization , steric effects , schiff base , cobalt , polymer , copolymer , ligand (biochemistry) , ethylene , photochemistry , oxygen , polymer chemistry , irradiation , materials science , chemistry , stereochemistry , catalysis , inorganic chemistry , organic chemistry , biochemistry , receptor , physics , nuclear physics
The reversible binding of oxygen to N , N ′‐ethylene bis(salicylideneiminato) cobalt(II) (CoS), to which a photo‐isomerizable naphthalenyl vinylpyridine residue of copolymer 1 coordinated, was investigated. The E form of the naphthalenyl vinylpyridine residues coordinating to CoS, ( E )‐ 1 ‐CoS, showed photo‐reversible isomerization into the Z form, ( Z )‐ 1 ‐CoS, on direct ultraviolet (UV) irradiation in a range of 335–345 nm and vice versa on another UV irradiation in a range of 285–295 nm. Reversible change of oxygen‐binding affinity of 1 ‐CoS corresponding to the photo‐reversible E / Z isomerization of the naphthalenyl vinylpyridine residues was also observed in absorption spectra. Steric hindrance of the polymer chain of 1 on the coordination of the naphthalenyl vinylpyridine residue of ( Z )‐ 1 to CoS was thought to cause the decrease of oxygen‐binding affinity of ( Z )‐ 1 ‐CoS. Copyright © 2011 John Wiley & Sons, Ltd.