Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (11): 1375-1380. Previous Articles    

Full Papers

电子自旋共振作为探针研究卤代溶剂的专属性效应

庞雪,申前进,赵晓冉,晋卫军*   

  1. (北京师范大学化学学院 北京 100875)
  • 投稿日期:2010-07-28 修回日期:2010-12-15 发布日期:2011-01-27
  • 通讯作者: 晋卫军 E-mail:wjjin@bnu.edu.cn
  • 基金资助:

    国家自然科学基金项目

Investigation on Specific Effect of Halogenated Solvents by ESR Probe

PANG Xue, SHEN Qian-Jin, ZHAO Xiao-Ran, JIN Wei-Jun   

  1. (College of Chemistry, Beijing Normal University, Beijing 100875)
  • Received:2010-07-28 Revised:2010-12-15 Published:2011-01-27
  • Contact: Wei Jun Jin E-mail:wjjin@bnu.edu.cn

The hyperfine splitting constants, AN, of electron spin probe, 4-hydroxy-2,2,6,6-tetramethyl-1- piperidin-1-yloxy, free radical (4-OH-TEMPO) show positive linear correlation with model reaction parameters of solvent polarity, ET(30) and solvent acceptor number (AN). Moreover, generally, AN values are higher in halogenated than non halogenated solvents as dielectron constant or dipole moment is near. Besides the general solvent effect on AN values, larger AN values can be attributed to the specific halogen-bonding between N—O free radical and halogenated solvent molecule. The calculation shows the occurrence of C—Cl…O between chloroform or dichloromethane and free radical molecules.

Key words: halogen-bonding, electron spin resonance, specific solvent effect, halogenated solvent, solvent acceptor number