波谱学杂志 ›› 1997, Vol. 14 ›› Issue (2): 173-178.

• 研究论文 • 上一篇    下一篇

咪唑类氮氧自由基的ESR波谱的酸度相关性-pH自旋探针应用研究之一

刘利1, 赵洪涛1, 马耀1, 张建中1, 丛建波2, 孙存谱2   

  1. 1. 中国科学技术大学研究生院化学部, 北京 100039;
    2. 军事医学科学院放射医学研究所, 北京 100850
  • 收稿日期:1996-10-03 修回日期:1996-11-18 出版日期:1997-04-05 发布日期:2018-01-22
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China

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 Online:1997-04-05 Published:2018-01-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China

摘要: 根据咪唑类氮氧自由基的结构特性合成了一系列的pH自旅探针,其ESR波谱参数均在一定范围内与介质的酸性呈明显的相关性.可望为较精确地测量化学胶束、细胞等微观体系的pH值开辟一个新的途径.本文研究了灵敏变化的pH范围与取代基的关系,得到了5种自旅探针的ESR参数-pH曲线、pKa值以及Hanmmett相关图,分析了如何通过改变取代基合成出不同pH变化范围并适用于不同生物和化学体系的pH自旅探针,最终达到付诸应用的目的.

关键词: 咪唑类氮氧自由基, pH自旋探针, ESR谱

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