高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (5): 907.

• 研究论文 • 上一篇    下一篇

2-氨基-2-咪唑啉异构化和质子迁移溶剂效应的密度泛函计算和Monte Carlo模拟

薛英1, 张慧1, 谢代前1,2, 鄢国森1   

  1. 1. 中国科学院山西煤炭化学研究所煤转化国家重点实验室, 太原030001;
    2. 中国科学院研究生院, 北京100039
  • 收稿日期:2004-06-18 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 薛 英(1962年出生),女,博士,教授,主要从事量子化学研究.E-mail:xueyingscu@163.com E-mail:xueyingscu@163.com
  • 基金资助:

    国家自然科学基金(批准号:20473055);教育部高等学校青年教师奖资助.

Density Functional Calculation and Monte Carlo Simulation of Solvating Effect of Tautomerism and Proton Transfer of 2-Amino-2-imidazoline

XUE Ying1, ZHANG Hui1, XIE Dai-Qian1,2, YAN Guo-Sen1   

  1. 1. Key Lab of Green Chemistry and Technology, Ministry of Education, Faculty of Chemistry, Sichuan University, Chengdu 610064, China;
    2. Institute of Theretical and Computational Chemistry, Department of Chemistry, Nanjing University, Nanjing 210093, China
  • Received:2004-06-18 Online:2005-05-10 Published:2005-05-10

摘要: 采用密度泛函理论和MonteCarlo模拟方法研究了2-氨基-2-咪唑啉在气相和水中的异构现象和质子迁移反应.考虑了直接迁移和水助催化迁移等两种质子迁移途径.气相中稳定点的几何结构和热力学性质是在B3LYP/6-311+G**理论水平上计算得到的.溶剂效应的研究结果表明,水作为溶剂可降低直接迁移途径的速率,有利于水助催化反应途径的进行.

关键词: 2-氨基-2-咪唑啉, 质子迁移, 溶剂效应, MonteCarlo模拟

Abstract: The density functional theory and Monte Carlo simulation were used to study the tautomerism and proton transfer of 2-amino-2-imidazoline in the gas phase and in water. Two reaction pathways, the direct and water-assisted transfers, were considered. The optimized geometrical structures and thermodynamic properties of stationary points for the reaction system in the gas phase were calculated at B3LYP/6-311+G~(**) level of the theory. The study of solvating effect of water on the proton transfer of 2-amino-2-imidazoline indicates that water as the solvent is favorable for the water-assisted process and slows the rate of the direct transfer pathway.

Key words: 2-Amino-2-imidazoline, Proton transfer, Effect of solvent, Monte Carlo simulation

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