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Ligand‐exchange chemistry of Cr 13 ‐polyacrylamide gels
Author(s) -
Burrafato Giovanni,
Albonico Paola,
Bucci Silvia,
Lockhart Thomas P.
Publication year - 1990
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.19900390112
Subject(s) - polyacrylamide , carboxylate , ligand (biochemistry) , chemistry , polymer , amide , polymer chemistry , rheology , inorganic chemistry , stereochemistry , materials science , organic chemistry , receptor , biochemistry , composite material
Evidence that ligand‐induced de‐gelation of Cr(+3)/polyacrylamide (PAAm) gels involves simple extraction of Cr(+3) from the gel matrix has been obtained from rheological studies. Kinetic experiments provide evidence that de‐gelation involves dissociative ligand exchange at Cr(+3). On the basis of de‐gelation results acetate is suggested to be a poor thermodynamic model for the bonding of PAAm to Cr(+3) and it is hypothesized that Cr(+3)/PAAm complexation may involve bonding to both a polymer carboxylate and a neighboring amide group.