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在CH3OH/TiO2 Rutile界面上的光生成孔的超快动力学

Weibin Chu, Wissam A Saidi1, Qijing Zheng

  • 1Department of Mechanical Engineering and Materials Science, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States.

Journal of the American Chemical Society
|September 23, 2016
PubMed
概括

了解分子/TiO2接口上的光生成电荷动态是光催化过程的关键. 这项研究表明,甲醇吸附结构,电子-声子合和温度显著影响CH3OH/rutile TiO2接口的孔转移和能量放松.

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Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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