Abstract
Interaction between poly(2-vinylpyridine) (P2VP) and bisacetylacetonato-cobalt(II) (Co(acac)2) in chloroform-d1 (CDCl3) solution was investigated by means of nuclear magnetic resonance spectroscopy. It was found that NMR signal of H-6 proton of the side-chain pyridine ring of P2VP shows a remarkable shift to lower fields by the addition of Co(acac)2. The large shift of H-6 proton indicates that the side-chain nitrogen atom is coordinated to the Co(acac)2. The dependence of the paramagnetic shift on the temperature and Co(acac)2 concentration suggests that the chemical exchange between complexed and uncomplexed states of side-chain of P2VP is rapid. The chemical exchange rate is characterized by an activation energy of 13 kcal/mol. The association constant of 1.2 mol−1 and the intrinsic paramagnetic shift of 9.3 ppm were obtained from the concentration dependence of the paramagnetic shift at room temperature for P2VP—Co(acac)2 complex.
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Higuchi, N., Hiraoki, T. & Hikichi, K. Proton Magnetic Resonance Studies of the Complex of Poly-(2-vinylpyridine) and Bisacetylacetonato Cobalt(II). Polym J 11, 139–143 (1979). https://doi.org/10.1295/polymj.11.139
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DOI: https://doi.org/10.1295/polymj.11.139