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Updated: Jul 5, 2025

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Published on: August 23, 2012

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通过设计聚合物光催化剂结构,克服在可见光和NIR光驱动的进化中的小带隙电荷重组

Mohamed Hammad Elsayed1,2,3,4, Mohamed Abdellah5,6,7, Ahmed Zaki Alhakemy8

  • 1Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt.

Nature communications
|January 24, 2024
PubMed
概括

新的有机聚合物纳米粒子有效地使用可见光和近红外光产生燃料. 这一突破利用了新的π-链接器来提高单元光催化剂中的电荷分离.

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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions10:21

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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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Catalysis

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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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The Z-Scheme of Electron Transport in Photosynthesis01:34

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