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関連する概念動画

Halogenation of Alkenes02:46

Halogenation of Alkenes

17.1K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
17.1K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.5K

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関連する実験動画

Updated: May 2, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

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溶液加工セシウムヘクサブロモパラデート (Cesium Hexabromopalladate) (IV),Cs2PdBr6,光電子用

Nobuya Sakai1, Amir Abbas Haghighirad1, Marina R Filip2

  • 1Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.

Journal of the American Chemical Society
|April 21, 2017
PubMed
まとめ

研究者らは新しい無鉛のペロブスキートCs2PdBr6を開発し,光電子機器に安定した耐水性代替品を提供した. この有望な材料は,優れた光発光と高度なアプリケーションに適した帯域の隙間を誇っています.

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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関連する実験動画

Last Updated: May 2, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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科学分野:

  • 材料科学
  • 固体物理学
  • 太陽光発電

背景:

  • 鉛ハリドペロブスキットは光電子と光伏の大きな可能性を示しています.
  • 商業化には,鉛の毒性,化学的不安定性,および水分感度が妨げられています.

研究 の 目的:

  • 新しい無鉛ペロブスキート関連化合物Cs2PdBr6を導入する.
  • 潜在的応用のための光電子特性と安定性を評価する.

主な方法:

  • Cs2PdBr6の溶液処理について
  • 光発光と光帯間隔の測定
  • 電子帯構造と有効質量に関する密度関数理論 (DFT) の計算.

主要な成果:

  • Cs2PdBr6は,長寿命の光発光と1.6 eVの光帯間隔で溶液処理可能である.
  • DFT計算は,特定の電子と穴の有効質量を持つ分散電子帯を明らかにします.
  • この化合物は鉛ベースのペロブスキートとは異なり,水への抵抗性が顕著である.

結論:

  • Cs2PdBr6は,光電子アプリケーションのための有望な無鉛の代替品です.
  • 耐水性は長期にわたる安定性を示唆している.
  • 材料の特性により,デバイス開発におけるさらなる調査に適しています.