Premium
Kinetics of metal exchange reaction of Cu(II)‐poly(vinyl alcohol) complex with Ca(II)‐ethylenediamine‐N,N,N′,N′‐tetraacetic acid in aqueous solution
Author(s) -
Suzuki Tuneo,
Shirai Hirofusa,
Hojo Nobumasa
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920590120
Subject(s) - vinyl alcohol , ethylenediamine , chemistry , metal , kinetics , aqueous solution , nuclear chemistry , alcohol , ligand (biochemistry) , inorganic chemistry , polymer chemistry , organic chemistry , polymer , biochemistry , physics , receptor , quantum mechanics
The kinetics of the metal exchange reaction between the Cu(II)‐poly(vinyl alcohol) complex (Cu(II)‐PVA) and Ca(II)‐ethylenediamine‐N,N,N′,N′‐tetraacetic acid (Ca(II)‐EDTA) were studied by mixing both solutions in a spectrophotometer at pH 9.7–11.0, at μ = 0.10(KNO 3 ) and at 25°C. The reaction is initiated by the formation of unstable Cu(II)‐H‐PVA by the attack of H + to Cu(II)‐PVA, and while both ligand exchange and metal exchange steps occur, the latter may be rate‐determining. The kinetic expression of this reaction was determined as ‐d[Cu(II)‐PVA]/dt = k[Cu(II)‐PVA] [H + ] [PVA]/[Ca(II)‐EDTA], where k = k 1 + k′ 2 [H + ], k 1 = 3.85 × 10 −2 sec −1 , k 2 = k′ 2 · K −H Cu(II)‐H‐PVA 9.59 × 10 5 1 mol −1 sec −1 .