有机化学 ›› 2001, Vol. 21 ›› Issue (1): 66-70. 上一篇    下一篇

研究论文

表征O-H解离能参数的AM1计算

张红雨;陈德展   

  1. 淄博学院生物与化学工程系;山东师范大学化学系.济南(250014)
  • 发布日期:2001-01-25

AM1 calculation of a parameter characterizing O-H bond dissociation 11:38 01-5-12energy

Zhang Hongyu;Chen Dezhan   

  1. Shandong Normal Univ, Dept Chem.Jinan(250014)
  • Published:2001-01-25

对17种酚类化合物用半经验量子化学方法AM1计算了表征O-H解离能的参数△HOF值,即酚类化合物与其经抽氢反应产生的自由基生成热之差。经过与实验测定的17种酚类化合物的O-H解离能比较,评价了AM1方法在计算△HOF值方面的有效性。发现AM1计算的△HOF值与O-H解离能有很好的相关性(γ=0.9495),优于经验方法,比如加和规则对O-H解离能的预测。虽然AM1方法在计算间位取代对O-H解离能的贡献方面是无效的,但将用于计算解离能类的参数以预测抗氧化剂活性还是可行的。

关键词: 解离能, 量子化学, 化学键, 键参数, 键能, 半经验方程,

The O-H bond dissociation energy (BDE) experimentally determined for 17 phgenols were employed to evaluate the effectiveness of AM1 method used in calculating a parameter characterizing the O-H BDE, the difference of heat of formation between phenol and its free radical generated after H- abstraction reaction (△ HOF). It was found that the AM1 calculated △ HOF correlated well with the O-H BDE (γ=0. 9495), and AM1 was better than empirical method such as additive rule derived from experiments to estimate the O-H BDE. Although AM1 was invalid to characterize the contribution of meta groups to the O- H BDE, it is fairly applicable in calculating BDE-like parameters to predict free radical scavenging activity of phenolic antioxidants.

Key words: QUANTUM CHEMISTRY, CHEMICAL BONDS, BOND PARAMETER, BOND ENERGY, SEMIEMPIRICAL EQUATIONS, PHENOL

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