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首页> 外文期刊>Chemistry: A European journal >Ground and excited state double hydrogen transfer in symmetric and asymmetric potentials: Comparison of 2,7,12,17-tetra-n-propylporphycene with 9-acetoxy-2,7,12,17-tetra-n-propylporphycene
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Ground and excited state double hydrogen transfer in symmetric and asymmetric potentials: Comparison of 2,7,12,17-tetra-n-propylporphycene with 9-acetoxy-2,7,12,17-tetra-n-propylporphycene

机译：对称和不对称电位中的基态和激发态双氢转移：2,7,12,17-四正丙基卟啉与9-乙酰氧基-2,7,12,17-四正丙基卟啉的比较

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摘要

Analysis of time-resolved anisotropy of transient absorption enabled determination of room temperature ground and excited state rate constants for intramolecular double hydrogen transfer in two similar porphycenes, one of them with symmetric and the other, with asymmetric character of a double minimum potential for hydrogen motion. The perturbation preserves a quasi-symmetric minimum in S_0, but the rate decreases approximately two times. In S1, the perturbed potential becomes strongly asymmetric, and the downhill hydrogen transfer occurs with a rate higher than that observed for a symmetrical compound.
机译：通过分析瞬态吸收的时间分辨各向异性，可以确定两个相似的卟啉中分子内双氢转移的室温基态和激发态速率常数，其中一个具有对称性，另一个具有非对称性，具有最小氢运动的双电势。扰动在S_0中保留了一个准对称最小值，但速率降低了大约两倍。在S1中，扰动的电势变得非常不对称，并且发生下坡氢转移的速率高于对对称化合物观察到的速率。

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