Abstract
The ‘catalytic’ effects of polyzwitterions on aqueous inter-ionic reactions were studied through the analysis of the influence of a representative zwitterionic macromolecule, poly[diethyl-(2-methacryloyloxyethoxy-2-ethyl)-1-(3-sulfopropyl) ammonium betaine], on two model inter-anionic and inter-cationic reactions, i.e. oxidation of ferrocyanide by persulfate and aquation of a bromopentaamminecobalt complex. The anionic system is clearly accelerated, but considerably less than with a cationic polyelectrolyte of similar structure, poly[triethyl-(2-methacryloyloxyethoxy-2-ethyl)-ammonium methylsulfonate. A small model zwitterion, (C 2H 5) 3-N +-(CH 2) 3-SO 3 −, has no effect. The inter-cationic reaction is not accelerated by the polyzwitterion.
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