首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Why Does trans-Azobenzene Have a Smaller Isomerization Yield for pi pi* Excitation Than for n pi* Excitation?
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Why Does trans-Azobenzene Have a Smaller Isomerization Yield for pi pi* Excitation Than for n pi* Excitation?

机译:为什么反式偶氮苯在pi pi *激发下的异构化收率比n pi *激发下的异构化收率小?

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摘要

A realistic dynamics simulation study is reported for the photoisomerization of trans-azobenzene.The isomerization follows both n pi*(the HOMO->LUMO)and pi pi*(the HOMO-1->LUMO)excitations.The simulation finds that for the pi pi* excitation,the relaxation of the S(pi pi*)state is immediately followed by double excitation,(PI)2(PI*)2.The decay from the S((PI)~2(PI*)~2)state to the S_0 state can occur at partially twisted structure,which favors the formation of the trans isomer.Multiple decay channels are found at about twisted structure for both n pi* and pi pi* excitations.Decay at about twisted geometry leads to the formation of either cis or trans isomer.Opening of the decay channel at partially twisted structure accounts for the smaller isomerization yield for the pi pi* excitation.
机译:据报道,对偶氮苯的光致异构化进行了现实的动力学模拟研究,异构化遵循n pi *(HOMO-> LUMO)和pi pi *(HOMO-1-> LUMO)激发。 pi pi *激发,S(pi pi *)态的弛豫紧接着是双重激发(PI)2(PI *)2。从S((PI)〜2(PI *)〜2衰减到S_0态的状态可能发生在部分扭曲的结构上,这有利于反式异构体的形成。对于n pi *和pi pi *激发,在大约扭曲的结构上都发现了多个衰减通道。在部分扭曲的结构上打开衰变通道,说明pi pi *激发的异构化收率较小。

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