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.
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Mori, Y., Yokoi, H. & Fujise, Y. Structural Investigation of Iron(III) and Copper(II) Complexes with Poly(vinyl alcohol) by NMR Techniques. Polym J 27, 271–279 (1995). https://doi.org/10.1295/polymj.27.271
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DOI: https://doi.org/10.1295/polymj.27.271
