Solvent Effects on the Spin-Lattice Relaxation Times and Chemical Shifts of <I>N</I>-Methylacetamide and <I>N</I>,<I>N</I>-Dimethylacetamide in Hydrogen Bonding Solvents
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概要
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The proton spin-lattice relaxation and the chemical shift were studied in <I>N</I>-methylacetamide (NMA) and <I>N</I>,<I>N</I>-dimethylacetamide (DMA) in <I>p</I>-dioxane and chloroform. In the <I>p</I>-dioxane solution, it has been found that the self-association of NMA does affect its spin-lattice relaxation, whereas the amide-solvent association does not affect it entirely. This was interpreted in terms of the lifetime of the inter-amide (\simeq10<SUP>−11</SUP>–10<SUP>−12</SUP> sec) and the amide-solvent association (much shorter than 10<SUP>−11</SUP>–10<SUP>−12</SUP> sec). On the other hand, the effect of the amidesolvent association on the spin-lattice relaxation is pronounced in chloroform, as is the effect of the self-association of NMA. The inter-amide interaction which leads the double-bond character of DMA to be more stable was not reflected distinctly in the concentration dependence of the spin-lattice relaxation times of DMA.
- 公益社団法人 日本化学会の論文
著者
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Sato Kazuo
Department Of Mechanical Engineering Ii Shibaura Institute Of Technology
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Nishioka Atsuo
Department of Polymer Chemistry, Faculty of Engineering, Tokyo Institute of Technology
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