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Updated: Sep 9, 2025

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
11:16

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

Published on: August 18, 2020

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光誘導電子効果によるプラチナ触媒の反応選択性を可能にする

Kowsalya Devi Rasamani1, Xinyan Dai1, Matthew Messner1

  • 1Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, USA.

Precision chemistry
|August 29, 2025
PubMed
まとめ

この研究は,Pt/SiOx光触媒を用いて,アリルヒドロキシラミンの高度選択的合成を行うグリーン戦略を導入する. プラチナ (Pt) ナノ結晶の光誘導による電子改変は反応選択性を高め,化学的変換における浪費を最小限にします.

キーワード:
ダイエレクトリック分散共振プラズモンの吸収を高める熱電子駆動化学光誘導による吸収/脱吸収選択的水素化選択的光触媒

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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.
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Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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