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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。
The quantum yield of photochemical hydrogen abstraction reaction between benzophenone and five kinds of chlorinated phenols was accurately determined by a pulsed laser photoacoustic microcalorimeter which was developed by ourselves. The effects of substituents on the quantum yield of hydrogen abstraction reaction were also discussed. The results showed that with the increase of the number of chlorine atoms in chlorophenols, steric hindrance increased, which made it more difficult to recombine the radicals generated after the hydrogen abstraction reaction, thus increasing the quantum yield of the hydrogen abstraction reaction. This method provides important information for people to understand the mechanism of photochemical hydrogen abstraction from the perspective of energy science.