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相关概念视频

VSEPR Theory02:37

VSEPR Theory

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Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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相关实验视频

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Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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稳定原子分散的Au与相邻的Pt用于空间精确的分子识别.

Rui Tang1, Xiangyu Xiao2, Jingyi Yao1

  • 1Key Laboratory of Organic Compound Pollution Control Engineering (MOE), School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 9, 2026
PubMed
概括

引入 (Pt) 原子可以在 (CeO2) 催化剂上稳定单个金 (Au) 原子. 这种辅助邻的策略增强了与复杂分子的相互作用,以改善选择性催化.

关键词:
Pt诱导的稳定性在原子分散的Au催化剂中.多中心活跃站点多中心活跃站点.类金属是类金属中的一种.空间精确的识别.

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科学领域:

  • 不同质的催化剂.
  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学

背景情况:

  • 原子分散黄金 (Au) 催化剂提供了明确的活性位点,但结构稳定性不佳.
  • 现有的Au催化剂与结构复杂的多功能分子 (SCMM) 相互作用有限,阻碍了选择性催化.
  • 稳定单原子催化剂 (SAC) 和提高它们对复杂基质的识别是关键的挑战.

研究的目的:

  • 开发一种可通用的策略,用于在 (CeO2) 支器上稳定单个Au原子.
  • 通过多站点识别,增强AU催化剂和SCMM之间的相互作用.
  • 为了提高SCMMs的电化学催化性能.

主要方法:

  • 合成富含缺陷的CeO2支持单个AU原子修改Pt (Au1Pt1-CeO2) 的合成.
  • 实验性表征 (例如,光谱,显微镜) 和计算分析 (例如,DFT).
  • 使用诺夫洛素 (NOR) 作为模型的电化学催化性能评估SCMM.

主要成果:

  • 通过加强Au-O轨道合和电子再分配,Pt结合通过抑制金属Au°形成来稳定Au单个原子.
  • Au1Pt1-CeO2催化剂具有多中心的配置,可以与NOR的功能组 (F, -COOH, -C=O) 进行合作相互作用.
  • 这导致增强的电化学催化活性和SCMMs的空间精确识别.

结论:

  • 靠近辅助的策略有效地稳定了单个Au原子,并促进了SCMM的多站点识别.
  • 的电子调制是稳定性的关键,这一原理可扩展到其他组金属 (PGM).
  • 这项工作为设计复杂分子的强大,以识别为导向的催化剂提供了新的视角.