期刊
COMPUTATIONAL AND THEORETICAL CHEMISTRY
卷 1018, 期 -, 页码 35-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.comptc.2013.05.026
关键词
Radical scavenging activity; Hydroxyurea; Hydroxamic acid derivatives; Ribonucleotide reductase; Tyrosyl radical
资金
- Sharif University of Technology
The free radical scavenging activity of a series of hydroxybenzohydroxamic acid derivatives have been studied in gas phase, water and benzene environments, using the density functional theory. Different mechanisms of reactions have been considered: single electron transfer (SET), hydrogen atom transfer (HAT). Rate constants were determined to know if the radical scavenging activity of these compounds proceeds via an H-atom or an electron-transfer mechanism. Calculations showed that the presence of the adjacent hydroxyl groups on phenyl ring increases the radical stability through intramolecular hydrogen bonds. The calculated bond dissociation enthalpy (BDE) values for hydroxyl groups on phenyl ring of studied compounds revealed the important role of resonance in stability of radical obtained from the hydrogen atom abstraction by free radical. Results show that the radical scavenging capacity of trimidox is more than the other molecules. The results demonstrate that the H-atom transfer mechanism for scavenging of free radical is more preferable than the single-electron transfer in considered environments. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据