Generation and ESR Spectrum of a Persistent and Oxygen-Insensitive Free Radical. 2,7-Di-t-butyl-1-pyrenoxy.
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概要
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Oxidation of 2,7-di-<I>t</I>-butyl-1-hydroxypyrene yields persistent and oxygen-insensitive 2,7-di-<I>t</I>-butyl-1-pyrenoxy radical (<B>2</B>) with the following ESR parameters: (<I>a</I><SUB>H</SUB>) 0.532, 0.449, 0.430, 0.389, 0.164, 0.110, and 0.095 mT (<I>a</I><SUB>H</SUB>), and 2.0037 (<I>g</I>). Radical <B>2</B> is isolated as a diamagnetic dimer which, upon dissolution, dissociates into <B>2</B> at room temperature. The Δ<I>H</I> and Δ<I>S</I> values for the dimer 2 radical equilibrium are determined to be 7.2 ± 2.0 kJ mol<SUP>−1</SUP> and −35 ± 15 J mol<SUP>−1</SUP> K<SUP>−1</SUP>, respectively. The negative Δ<I>S</I> value is briefly discussed.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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