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中文摘要：
4-羟基-2,2,6,6-四甲基哌啶-1-氧自由基（4-OH-TEMPO）电子自旋共振的超精细耦合常数AN与溶剂极性的微观反应常数ET（30）和溶剂受体数AN呈现线性正相关.并且在介电常数或偶极矩接近时,含卤溶剂中超精细耦合常数AN普遍偏高.除了一般的溶剂效应外,在含卤溶剂中超精细耦合常数AN偏大的原因与专属性的卤键作用有关.理论计算结果辅助印证了这一结论.
英文摘要：
The hyperfine splitting constants,AN,of electron spin probe,4-hydroxy-2,2,6,6-tetramethyl-1piperidin-1-yloxy,free radical（4-OH-TEMPO） show positive linear correlation with model reaction pa-rameters 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.Be-sides the general solvent effect on AN values,larger AN values can be attributed to the specific halo-gen-bonding between N-O free radical and halogenated solvent molecule.The calculation shows the oc-currence of C-Cl…O between chloroform or dichloromethane and free radical molecules.
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