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| In addition to the trans isomer, photoexcitation of cis-stilbene generates the cyclic product 4a,4b-dihydrophenanthrene in 10% yield. The yields of the three processes add up to ~1, suggesting that only one pathway may be available for the deactivation excited stilbene. Trans-stilbene is thermodynamically more stable; however, the barrier to thermal isomerization is significantly larger than that of AB, and the rate of thermal isomerization at room temperature is very slow.Dynamic simulations and ab initio lculations predict isomerization of stilbene to be dominated by rotation, with some contribution from skeletal deformations. A crossover point between S1 and S0 states has been located near a torsional angle of 90. Both trans and cis-stilbene must acquire the same conformation prior to S0 ←S1 intersystem crossing; however a small barrier exists on the side of the trans isomer. As a result, the S1 state of trans-stilbene has a considerably longer lifetime than that of the cis isomer. Ultrafast timeresolved spectroscopy has revealed S0←S1 relaxation of stilbene to be unimodal. |
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武汉一心一译 
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2楼2015-04-21 10:07:32
武汉一心一译
捐助贵宾 (著名写手)
- 翻译EPI: 502
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3楼2015-04-21 10:08:21
武汉一心一译
捐助贵宾 (著名写手)
- 翻译EPI: 502
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wskk: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 谢谢你了 2015-04-21 11:16:28
wskk: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 谢谢你了 2015-04-21 11:16:28
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In addition to the trans isomer, photoexcitation of cis-stilbene generates the cyclic product 4a,4b-ihydrophenanthrene in 10% yield. 除了反式异构体，顺势光激励也能生成环状产物4a,4b-二氢菲（产率为10%）。 The yields of the three processes add up to ~1, suggesting that only one pathway may be available for the deactivation excited stilbene. 三个步骤的产率增加到了 ~1，这就标明，其中只有一个方法能够钝化刺激的对称二苯代乙烯。 Trans-stilbene is thermodynamically more stable; however, the barrier to thermal isomerization is significantly larger than that of AB, and the rate of thermal isomerization at room temperature is very slow. 虽然二苯乙烯的热力学稳定性更高，然而，其热异构化的困难比实现AB异构化的困难要大得多，而且在室温环境中，热异构化速率非常慢。 Dynamic simulations and ab initio calculations predict isomerization of stilbene to be dominated by rotation, with some contribution from skeletal deformations. 受骨骼形变的启发，动态仿真和从头计算法预测，对称二苯代乙烯异构将由分子旋转完成。 A crossover point between S1 and S0 states has been located near a torsional angle of 90. Both trans and cis-stilbene must acquire the same conformation prior to S0 ←S1 intersystem crossing; however a small barrier exists on the side of the trans isomer. 经过定位，S1和S0质检的交叉点接近于90度的扭转角。在系统由S1穿越到S0之前，无论顺式和反式异构都必须有同样的构象；其中对于反式异构体，这存在一点小小的困难。 As a result, the S1 state of trans-stilbene has a considerably longer lifetime than that of the cis isomer. Ultrafast timeresolved spectroscopy has revealed S0←S1 relaxation of stilbene to be unimodal. 因此，比起顺式异构体，反式-二苯乙烯的S1状态相当的长。 极速时间分辨光谱法标明，对称二苯代乙烯又S1状态缓冲到S0状态是单向的。 |
4楼2015-04-21 10:33:08
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