Solvent Effects on the Spin-Lattice Relaxation Times and Chemical Shifts of <I>N</I>-Methylacetamide and <I>N</I>,<I>N</I>-Dimethylacetamide
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概要
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The spin-lattice relaxation time <I>T</I><SUB>1</SUB> and chemical shift of <I>N</I>-methylacetamide (NMA) and <I>N</I>,<I>N</I>-dimethylacetamide (DMA) were measured in D<SUB>2</SUB>O and CCl<SUB>4</SUB> solutions. In D<SUB>2</SUB>O solution, it has been found that the weak interamide hydrogen bonding of NMA does not affect the spin-lattice relaxation entirely, and the molecular motion of NMA and DMA is almost identical. However, quite different results were obtained for CCl<SUB>4</SUB> solution. The molecular association of NMA in CCl<SUB>4</SUB> solution is strong enough to exhibit appreciable effects on spin-lattice relaxation. The life time of the associated molecules has been estimated to be longer than 10<SUP>−10</SUP>–10<SUP>−11</SUP> sec. The association of DMA at high concentration region in CCl<SUB>4</SUB> could be verified from the concentration dependence of the spin-lattice relaxation rate as well as chemical shift.
- 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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