Functional metallomacrocycles and their polymers, 27. Catalase-like activity of water-soluble polymer containing a phthalocyanine-manganese complex

✍ Scribed by Mutsumi Kimura; Tadayoshi Nishigaki; Toshiki Koyama; Kenji Hanabusa; Hirofusa Shirai

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 454 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021951018

✦ Synopsis

Abstract

The decomposition reaction of hydrogen peroxide by a water‐soluble polymer containing phthalocyanine‐Mn (1c, 1d) was studied in aqueous solution. The catalase‐like activity was varied by the kind of added nitrogen base and its concentration. The catalase‐like activity is also dependent upon the basicity of the nitrogen base and the equilibrium constant for the coordination of the nitrogen base to phthalocyanine‐Mn in lc or 1d. In this catalytic system, the deprotonation of hydrogen peroxide and the formation of a five‐coordinated manganese species are an important factor in the catalase‐like activity. Copolymers 1c and 1d have high activity as catalyst for the decomposition of hydrogen peroxide in the presence of dimethylaminopyridine (DMAPy). The catalytic system obeys Michaelis‐Menten kinetics with respect to the concentration of hydrogen peroxide. The reaction proceeds according to a mechanism similar to that of a reaction catalyzed by catalase.