TY - JOUR
T1 - Complexation constants of lanthanide ions with poly(methacryl1c acid] and its copolymers
AU - Nishide, H.
AU - Izushi, T.
AU - Arai, H.
AU - Yoshioka, N.
AU - Tsuchida, E.
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture, Japan.
PY - 1987
Y1 - 1987
N2 - Complexation of some lanthanide ions with poly(methacry1ic acid) and its copolymers was studied by potentiometric titration. Poly [methacrylic acid-co-oligo(ethy1ene oxide)rnethacrylate] and poly(methacrylic acid-co-acrylamide) formed tris-carboxylate coordinate lanthanide complexes with large overall complexation constants, while poly- (methacrylic acid)s and copolymer with higher content of the methacrylic acid residue formed bis-coordinate ones. It was concluded that the comonomer residues in the copolymer chains decreased the steric hindrance for the complexation and/or acted as co-coordinating groups of the carboxylic group to lanthanide ions. Very large positive and favorable entropy changes were observed for the complexation with poly(methacry1ic acid) and its copolymers. This contribution of thermodynamic parameters to the complexation was contrary to that for the analogous monomeric methacrylic acid complex and is assumed to be induced by dehydration of the polymers through the lanthanide ion complexation.
AB - Complexation of some lanthanide ions with poly(methacry1ic acid) and its copolymers was studied by potentiometric titration. Poly [methacrylic acid-co-oligo(ethy1ene oxide)rnethacrylate] and poly(methacrylic acid-co-acrylamide) formed tris-carboxylate coordinate lanthanide complexes with large overall complexation constants, while poly- (methacrylic acid)s and copolymer with higher content of the methacrylic acid residue formed bis-coordinate ones. It was concluded that the comonomer residues in the copolymer chains decreased the steric hindrance for the complexation and/or acted as co-coordinating groups of the carboxylic group to lanthanide ions. Very large positive and favorable entropy changes were observed for the complexation with poly(methacry1ic acid) and its copolymers. This contribution of thermodynamic parameters to the complexation was contrary to that for the analogous monomeric methacrylic acid complex and is assumed to be induced by dehydration of the polymers through the lanthanide ion complexation.
UR - http://www.scopus.com/inward/record.url?scp=1542561034&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1542561034&partnerID=8YFLogxK
U2 - 10.1080/00222338708074451
DO - 10.1080/00222338708074451
M3 - Article
AN - SCOPUS:1542561034
SN - 1060-1325
VL - 24
SP - 343
EP - 351
JO - Journal of Macromolecular Science - Pure and Applied Chemistry
JF - Journal of Macromolecular Science - Pure and Applied Chemistry
IS - 3-4
ER -