Abstract
Structural and dynamic properties of the poly(N-vinylpyrrolidone)–Cu(II) complex in aqueous solution are studied by 13C NMR relaxation measurements. At pH 4, the spin-lattice relaxation rate of the carbonyl carbon increases remarkably with increasing Cu(II) concentration. This indicates that Cu(II) interacts with the carbonyl group at low pH. The temperature dependence of relaxation rate is explained in terms of the electron–13C dipolar interaction, the 1H–13C dipolar interaction, and the chemical shift anisotropy interaction. The distance between Cu(II) and the carbonyl carbon is evaluated to be 4.0 Å at pH 4.
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Tsuchiya, Ki., Takegoshi, K. & Hikichi, K. 13C NMR Study of Poly(N-vinylpyrrolidone)–Cu(II) Complex in Aqueous Solution. Polym J 26, 479–483 (1994). https://doi.org/10.1295/polymj.26.479
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DOI: https://doi.org/10.1295/polymj.26.479