Chinese Journal of Magnetic Resonance ›› 1997, Vol. 14 ›› Issue (2): 173-178.

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THE INFLUENCE OF MEDIUM ACIDITY ON THE ESR SPECTRA OF IMIDAZOLINE NITROXIDE RADICALS: The Application Research of pH Spin Probes Ⅰ

Liu Li1, Zhao Hongtao1, Ma Yao1, Zhang Jianzhong1, Cong Jianbo2, Sun Cunpu2   

  1. 1. Graduate School, Academia Sinica, Beijing 100039;
    2. Institute of Radiation Medicine, Beijing 100850
  • Received:1996-10-03 Revised:1996-11-18 Published:1997-04-05 Online:2018-01-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China

Abstract: Imidazoline nitroxide radicals were synthesized and studied as "pH probes".The influence of pH on the ESR spectra of the radicals were discussed and their pKa values were measured. The substituent R on the phenyl ring has an effect on the proton exchangerate of the N3 atom which is related to the pKa value of the nitroxide radical.

Key words: Imidazoline nitroxide radical, pH spin probe, ESR