高等学校化学学报

高等学校化学学报 ›› 1984, Vol. 5 ›› Issue (6): 845.

• 研究快报 • 上一篇    下一篇

氮氧自由基的研究(ⅩⅤ)——2,2,6,6-四甲基-4-羟基哌啶-1-氧自由基各向异性的测定

王玉琨, 刘有成   

  1. 兰州大学化学系
  • 收稿日期:1984-08-27 出版日期:1984-12-24 发布日期:1984-12-24

Studies on Nitroxides (ⅩⅤ)——The ESR Anisotropism of 2,2, 6,6-Tetramethyl-4-Hydroxy- Piperidine-1-oxy Radical

Wang Yukun, Liu Youcheng   

  1. Department of Chemistry, Lazhou University Lanzhou
  • Received:1984-08-27 Online:1984-12-24 Published:1984-12-24

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摘要： 溶液中的氮氧自由基分子处于快速的翻滚运动中,各向异性超精细相互作用完全被平均掉,只能观察到各向同性超精细分裂,电子自旋共振(ESR)谱为特征的三峰谱.从自由基各向异性的研究,可以得到有关自由基的取向、分子间相互作用和自由基结构等有用信息[1].但是,迄今有关氮氧自由基各向异性研究的报导却很少[2].粉末和固体样品观察不到由14N核引起的超精细分裂,提供的信息较少.

Abstract: Single crystals of 2,2, 6, 6-tetramethyl-4-hydroxypiperidine (1) were prepared, in which the 2, 2, 6, 6-tetramethyl-1-hydroxypiperidine-l-oxy radical was as an impurity. The Atensor of nitroxide radical cited above (2) has been determined and the eigenvalues of tensor Aare calculated to be 7.2, 5.2, and 33.8 Grespectively. The ESRspectra of (2) observed indicate the existence of six lines corresponding to two types of paramagnetic centers with different orientations in the matrix of (1), each of which contributing its triplet.

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