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Home  >  Journal list  >  Polymer Journal  >  Vol.27  No.3 (1995)  >  pp.271-279

Polymer Journal
<<Previous article Vol.27  No.3 (1995)   pp.271 - 279 Next article>>

Structural Investigation of Iron(III) and Copper(II) Complexes with Poly(vinyl alcohol) by NMR Techniques

Yasuyoshi Mori1), Hiroshi Yokoi1) and Yutaka Fujise2)
1) Department of Applied Chemistry, Faculty of Engineering, Shizuoka University
2) Department of Chemistry, Hamamatsu University School of Medicine

ABSTRACT:  Structures of the iron(III) and copper(II) complexes with poly(vinyl alcohol) (PVA) have been investigated in full detail by NMR techniques, especially through analysis of nuclear magnetic relaxation processes due to paramagnetic metal ions. As a result, it appears well established that the complexes are of a kind in which iron(III) or copper(II) hydroxide-like clusters are included by PVA chains with hydrophobic backbones toward the inside clusters and with hydrophilic OH groups toward the outside bulk water, meaning that the interaction between the clusters and PVA is of a hydrophobic type. By such an interaction, the complexes have certain definite structures, because there is always a linear relationship between the 1H NMR signal intensity of PVA and the concentration of metal ion in every system of complex formation. In the case of the PVA of not less than 250 in the degree of polymerization, however, there has also appeared another linear relationship with a more gentle slope over a relatively high concentration range of iron(III), suggesting that such PVA molecules can form both complexes containing only one and two or more clusters.

Poly(vinyl alcohol)/ Degree of Polymerization/ Iron(III) Complex/ Copper(II) Complex/ Metal Hydroxide-Like Cluster/ 1H NMR Signal Intensity/ NMR Relaxation Rate/ Hydrophobic Interaction

Published online: April 02, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan



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