ENDOR and TRIPLE Studies of Diphenyl Nitroxide(DPNO).
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概要
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ENDOR and triple resonance (GTR) of diphenyl nitroxide (DPNO) were observed in solution; it was demonstrated that DPNO is an interesting model radical forming a three-spin system (electron and <SUP>1</SUP>H- and <SUP>14</SUP>N-nuclear spins). The detected <SUP>14</SUP>N-ENDOR belongs to one of the smallest hyperfine cases (<I>A</I><SUB>N</SUB>=0.9653 mT). Its optimum temperature was 210 K, higher than that of the <SUP>1</SUP>H, which is due to the large anisotropic hyperfine interaction of <SUP>14</SUP>N. In the <SUP>1</SUP>H-ENDOR spectra the effect of cross relaxation was observed, as in the case of the <SUP>14</SUP>N-ENDOR lines; their temperature variations of intensity showed two maximum regions, one due to the optimum energy relaxation in the <SUP>14</SUP>N-spin system and the other due to the energy relaxation inherent in the <SUP>1</SUP>H-spin system. In the triple studies new phenomena were pointed out: An enhancement saturation effect due to the large hyperfine interaction and an intensified enhancement or de-enhancement effect due to the cross relaxation.
- 公益社団法人 日本化学会の論文
著者
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FUJITA Hideo
College of Liberal Arts and Sciences, Kyoto University
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Fujita Hideo
College Of Liberal Arts And Sciences Kyoto University
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Deguchi Yasuo
College Of Liberal Arts And Science Kyoto University
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Yamauchi Jun
College Of Liberal Arts And Sciences Kyoto University
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