物理化学学报 >> 1995, Vol. 11 >> Issue (04): 308-314.doi: 10.3866/PKU.WHXB19950405

研究论文 上一篇    下一篇

光引发BrC2F4Br+C2F4调聚反应的光强影响

张临阳,张家穆,W.Fuss   

  1. 中国技术大学应用化学系|合肥 230026;Max-Planck-Institute fuer Quantenoptik D-85740 Garching,F.R.Germany
  • 收稿日期:1994-03-22 修回日期:1994-06-06 发布日期:1995-04-15
  • 通讯作者: 张临阳

The Effect of Light Intensity on the Photoinduced BrC2F4Br+C2F4 Telomerization Reaction

Zhang Lin-Yang,Zhang Jia-Mu,W.Fuss   

  1. University of Science and Technology of China,Hefei 230026|Max-Planck-Institute fuer Quantenoptik D-85740 Garching,F.R.Germany
  • Received:1994-03-22 Revised:1994-06-06 Published:1995-04-15
  • Contact: Zhang Lin-Yang

摘要:

实验发现,在光引发BrC2F4Br+C2F4调聚反应中,光强(或光功率密度)能影响产品分布。提出了反应机理:此反应由加成反应与复合反应组成,而链转移反应可忽略.由此进行了动力学计算,为与实验结果吻合,拟合得的加成反应BrC2F4+C2F4的速率常数为(2±1)×107cm3•mol-1•s-1,Br(C2F4)n≧2+C2F4的速率常数为(1.2±0.4)×107Cm3•mol-1•s-1

关键词: 光反应, 调聚反应, 反应机理, 加成反应速率常数

Abstract:

BrC2F4Br+C2F4 reaction induced by different light source (KrF laser, Xe-lamp, low pressure Hg-lamp) has been investigated. Experiments show that the reaction product distribution depends not only on reaction composition, but on light intensity and light source as well. A reaction mechanism has been suggested and the rate constant of the addition reaction has been calculated by kinetic analysis, for BrC2F4+C2F4→BrC4F8 kadd=(2±1)×107cm3•mol-1•s-1 (room temp.); Br(C2F4)n≧2+C2F4 addition reaction, kadd=(1.2±0.4)×107Cm3•mol-1•s-1.

Key words: Photoreaction, Telomerization, Rection mechanism, Rate constant of addition reaction