Abstract
The kinetics of the ligand exchange reaction of the Cu(II)–poly(vinyl alcohol) (PVA) complex with ethylenediamine-N,N,N′,N′-tetraacetic acid (edtaH4) was studied by a stopped-flow method at pH 9.34—11.05, at μ=0.1 (KNO3) and at 25.0°C. The substitution reaction proceeds simultaneously through two different reaction paths. In one path, the reaction is initiated by the attack of H+ on the bond between Cu(II) ion and dissociated –O− of PVA to form unstable Cu(II)–H-PVA. In the other path, solvolysis by water as a nucleophilic reagent proceeds. The rate law is written as –d[Cu(II)–PVA]/dt=k[Cu(II)–PVA]/[PVA] where k=k1+k2′H+], k1=3.62×10−3 Ms−1 and k2′=2.83×107 s−1 respectively. The rates were found to be independent of the edta anion concentration. A possible mechanism for the substitution reaction is discussed.
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Suzuki, T., Shirai, H., Shimizu, F. et al. Kinetics of Ligand Exchange Reaction of Cu(II)–Poly(vinyl alcohol Complex with Ethylenedianune-N,N,N′,N′-tetraacetic Acid. Polym J 15, 409–414 (1983). https://doi.org/10.1295/polymj.15.409
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DOI: https://doi.org/10.1295/polymj.15.409
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