ESR Studies of Stable Free Radical Pairs in the Diamagnetic Matrix Crystal

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概要

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• The radical pair system of a stable free radical, di-<I>p</I>-anisyl-nitric-oxide (DANO), has been observed in the magnetically-diluted crystal of 4,4-dimethoxy-benzophenone. The existence of the radical pair has been ascertained by the characteristic ESR absorptions, which give rise to the zero-field splitting and half-field resonance, of the powdered sample as well as by a comparison of the magnitude of the hyperfine coupling constant of the isolated radical with that of the pair system. The precise ESR measurements were performed using a single crystal containing 7.5% DANO radicals oriented well in the diamagnetic matrix. The fine structure parameters, |<I>D</I>| and |<I>E</I>|, have been determined to be 186 Gauss and 2 Gauss respectively, from which the distance between the two radical molecules in the pair system is estimated to be 5.4 Å. In order to deduce the structures of the radical pair, the <I>g</I>-value and the hyperfine coupling constant of the isolated radical have also been determined.

• 公益社団法人 日本化学会の論文

著者

• Deguchi Yasuo

  College Of Liberal Arts And Science Kyoto University

• Yamauchi Jun

  The Institute For Chemical Research Kyoto University

• Ohya-Nishiguchi Hiroaki

  Department of Chemistry, Faculty of Science, Kyoto University

• Takizawa Osamu

  Department of Chemistry, Faculty of Science, Kyoto University

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