14N nuclear quadrupole relaxation in sulfuric diamide and methanesulfonamide.

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概要

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• The <SUP>14</SUP>N nuclear quadrupole resonances (NQR) in sulfuric diamide (sulfamide), H<SUB>2</SUB>NSO<SUB>2</SUB>NH<SUB>2</SUB>, and methanesulfonamide, CH<SUB>3</SUB>SO<SUB>2</SUB>NH<SUB>2</SUB>, were studied by the pulse method. The resonance frequency and the spin-lattice relaxation time (<I>T</I><SUB>1</SUB>) were measured in the temperature range from liquid nitrogen temperature to room temperature. In the case of sulfuric diamide, <I>T</I><SUB>1</SUB> decreases monotonously as the temperature rises, and is dominated by the thermal torsional motion below 140 K. On the other hand, <I>T</I><SUB>1</SUB> is attributed to the reorientation of the amino group in the temperature range from 200 to 240 K, whereas it is due to the reorientation of the molecule above 240 K; the activation energies in these orientations are 43.5 and 61.5 kJ·mol<SUP>−1</SUP> respectively. In the case of methanesulfonamide, the minimum of <I>T</I><SUB>1</SUB> is found near 130 K. This is caused by the rotation of the methyl group. The activation energy for this motion is calculated to be 9.6 kJ·mol<SUP>−1</SUP>. The dominant relaxation mechanism is attributed to the reorientation of the amino group from 200 to 240 K and to the reorientation of the molecule above 240 K. The activation energies for these motions are 19.2 and 40.6 kJ. mol<SUP>−1</SUP> respectively.

• 公益社団法人 日本化学会の論文

著者

• Okuda Tsutomu

  Department Of Bio-recycling Faculty Of Engineering Hiroshima Kokusai Gakuin University

• Negita Hisao

  Department Of Chemistry Faculty Of Science Hiroshima University

• Kubo Tsuneo

  Department of Chemistry, Faculty of Science, Hiroshima University

• Maekawa Michio

  Department of Chemistry, Faculty of Science, Hiroshima University

• Ueda Akinobu

  Department of Chemistry, Faculty of Science, Hiroshima University

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