摘要
用自行研制的脉冲激光光声微量量热计准确测定了二苯酮与5种氯代苯酚光化夺氢反应的量子产率 ,探讨了取代基对夺氢反应量子产率的影响。结果表明 ,随着氯代酚中氯原子数目的增多 ,空间位阻增大 ,致使发生夺氢反应后生成的自由基较难复合 ,从而提高了夺氢反应的量子产率。该法为人们从能量学的角度深入了解光化夺氢的机理提供了重要信息。
ion reaction of benzophenone with five chlorophenols were measured by using self _ made laser pulsed photoacoustic microcalorimeter as well as the effects of substituents on ФH were discussed. The results showed that ФH increased with increasing numbers of chlorine atom in chlorophenols. This is due to the existence of larger steric hindrance in chlorophenols introduced by more chlorine atoms, which prohibited the recombination of free radicals produced by photoinduced hydrogen abstraction reaction. This method provides some important information to help further study of the mechanism of photoinduced hydrogen abstraction reaction in the view of energetics.
出处
《分析测试学报》
CAS
CSCD
2000年第4期12-15,共4页
Journal of Instrumental Analysis
基金
国家自然科学基金!资助项目(29773350
29777020)
关键词
量热计
光化夺氢
量子产率
二苯酮
氯代酚
测定
Laser pulsed photoacoustic calorimeter
Quantum yield
Photoinduced hydrogen abstraction reaction
