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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (8): 805-810. 上一篇    下一篇

研究论文

N-(2,2,6,6-四甲基-4-哌啶基-1-氧)-N＇-芳酰氨基硫脲EPR波谱的溶剂效应

张自义;施继成;汪汉卿;冯良波   

  1. 兰州大学化学系;中国科学院兰州化学物理研究所
  • 发布日期:1992-08-15

Solvent effects on EPR spectra of nitroxides of N-(2,2,6,6-tetramethyl-4-piperidyl-1-oxyl)-N-(aryl-formyl) thiosemicarbazides

ZHANG ZIYI;SHI JICHENG;WANG HANQING;FENG LIANGBO   

  • Published:1992-08-15

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本文研究了五种哌啶类稳定氮氧自由基在九种极性不同的溶剂 中EPR谱特性。观察到超精细分裂常数A~N与Kosower Z值、Reichardt E~T值之间存在良好的线性关系。同时还发现=N_O共轭键在外磁场作用下所产生的三组裂磁能中每两组相邻能级的能量差ΔE、氮原子上的π电子自旋密度P^x~N值与Z、E~T值也有良好的线性关系。以及自由基旋转相关时间τ、高场峰相对高度h~r与溶剂粘度η值之间也呈线性关系。

关键词: 哌啶 P, 顺磁共振, 溶剂效应, 氮氧自由基, 酰氨基硫脲

The behavior of 5 title nitroxides I (R = H, F, Cl, Me, MeO) in 9 solvents with different polarity has been studied by EPR spectrometry. It was observed that the hyperfine splitting constants AN of the nitroxides have good linear correlations with some solvents parameters such as Kosowere constants Z and Reichardt constants Et. It was also found that the energy difference of adjacent energy levels DE, as well as the spin-electron d. at nitrogen atom PpN has good correlation with Z and E constants Furthermore, the rotational correlation time t, the heights of the upfield EPR lines were found to be linearly correlated with the solvent viscosity h.

Key words: PIPERIDINE P, PARAMAGNETIC RESONANCE, SOLVENT EFFECT, NITRO-OXY RADICAL

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