1980 Volume 37 Issue 10 Pages 665-669
The complex formation of Cu (II) ion with partially acylated (acetylated and propionated) poly (vinyl alcohol) which were soluble in water were investigated in an aqueous solution. Cu (II) ion coordinated selectively to 1, 3-glycol units in vinyl alcohol (VA) -vinyl acetate (VAc) copolymers, while hardly coordinated to carbonyl groups of VAc units. The formation constants of the complexes decreased with increase in the degree of acylation of the copolymers as shown by Gregor-Bjerrum's method. Above 35mol% of the degree of acylation in VA-VAc copolymers, the complexes had the Cu (II) ion in the incompletely four-coodrdinated planar structures. This hindrance effect by the non-coordinated acetyl groups decreased with increase in VAc units existing continuously in the polymer chain.
