Ligand‐exchange chemistry of Cr 13 ‐polyacrylamide gels | Zendy

Burrafato Giovanni | Zendy; Albonico Paola | Zendy; Bucci Silvia | Zendy; Lockhart Thomas P. | Zendy

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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.

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