Acta Chimica Sinica ›› 1992, Vol. 50 ›› Issue (8): 805-810. Previous Articles     Next Articles

Original Articles

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
  • 出版日期:1992-08-15 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   

  • Online:1992-08-15 Published:1992-08-15

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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