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Updated: Feb 25, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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结合TiO2保护Si光电极的分子基水氧化催化剂的光电化学行为

Roc Matheu1,2, Ivan A Moreno-Hernandez3, Xavier Sala4

  • 1Institute of Chemical Research of Catalonia (ICIQ) , Avinguda Països Catalans 16, 43007 Tarragona, Spain.

Journal of the American Chemical Society
|August 8, 2017
PubMed
概括

研究人员使用基于碳纳米管和的氧化水前催化剂开发了一种混合光电极. 这种新型电极在照明下有效地产生氧气,保持稳定性和催化剂完整性.

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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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