Effect of Methyl Substitution on the Electron Spin Resonance Spectra of Yang’s Biradical
作者:Kazuo Mukai
DOI:10.1246/bcsj.52.1911
日期:1979.7
(III) of Yang’s biradical (I) were prepared, and the methyl-substitution effects on the molecular symmetry and spin-density distribution of Yang’s biradical have been studied. Resolved hyperfine structures were observed in the ESR spectra of liquid solutions of the biradicals (II) and (III), giving the hyperfine splitting values theoretically expected for their triplet states. In a fluid solution, the
制备了杨氏双自由基 (I) 的单和二甲基衍生物 (II) 和 (III),并研究了甲基取代对杨氏双自由基分子对称性和自旋密度分布的影响。在双自由基 (II) 和 (III) 的液体溶液的 ESR 光谱中观察到解析的超精细结构,给出了理论上预期的三重态超精细分裂值。在流体溶液中,双自由基分子保持三重对称性,正如杨的双自由基所报道的那样,预期的甲基取代效应太小,无法引起任何不对称的、不成对的自旋分布。(II) 和 (III) 双自由基的 g-和 D-张量值是通过对含有双自由基的冷冻溶液的不对称 ESR 光谱的分析来确定的。结果表明,这些双自由基在冷冻溶液中也必须缺乏三重对称性,正如杨的双自由基所观察到的那样。本质上与杨的 g-和 D-张量值相同...