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本文研究四种哌啶系氮氧自由基在固态与在溶液中的ESR特性.它们在固态均显示单峰波谱,而在浓度小于1×10~(-2)M的溶液中则显示三峰波谱.观察并比较溶液中的自由基浓度、溶剂的极性和粘度对ESR波谱五种参数的影响。在超精细分裂常数 A_N与溶剂极性参数 Kosower Z值之间得出线性关系.实验数据表明,自由基的旋转相关时间τ亦与溶剂粘度η成线性关系.并发现高场峰的相对高度与η成反比.对氮氧自由基的这些ESR特性作了讨论。
In this paper, the ESR properties of four piperidine nitroxides in the solid state and in solution were studied.They all showed single peak spectra in the solid state, while the three peak spectra in the solution less than 1 × 10 ~ (-2) M Observe and compare the effects of free radical concentration, solvent polarity and viscosity on the five parameters of ESR spectrum. The linear relationship between the hyperfine splitting constant A_N and the solvent polarity parameter Kosower Z is obtained.The experimental data show that the rotation time τ of the free radical also has a linear relationship with the solvent viscosity η and the relative height η are inversely proportional to these nitroxide ESR characteristics are discussed.