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相关概念视频

Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a polar...
Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...

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Updated: Jul 9, 2026

Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism
09:36

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Published on: July 18, 2018

在单个CH3SSCH3分子在Au上的表面对齐解离中构造的传播111)

Peter Maksymovych1, John T Yates

  • 1Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

Journal of the American Chemical Society
|August 17, 2006
PubMed
概括
此摘要是机器生成的。

在黄金表面的二甲基二硫化物 (CH3SSCH3) 的电子诱导解离会保持分子构造. 在75%的病例中观察到的这种形状保持,可能是由于S-S键断裂期间的表面对齐.

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科学领域:

  • 表面科学是一门学科.
  • 化学物理 化学物理
  • 材料科学 材料科学 材料科学

背景情况:

  • 在表面上的二甲基二硫化物 (CH3SSCH3) 吸附对于理解化学反应至关重要.
  • 电子诱导解离是表面化学修饰的关键过程.
  • Au(111) 表面作为研究分子相互作用的模型基板.

研究的目的:

  • 为了研究单个CH3SSCH3分子在Au(111) 表面上被吸附的形状.
  • 为了确定电子诱导解离对分子构造的影响.
  • 阐明在S-S键裂解过程中保持形状的背后的机制.

主要方法:

  • 单个CH3SSCH3分子在Au上吸附.
  • 电子诱导解离实验.电子诱导的解离实验.
  • 对产品碎片 (CH3S) 在表面上的位置和方向的分析.

主要成果:

  • CH3SSCH3分子在Au(111) 上的变形中吸附.
  • 电子诱导的解离将S-S键裂开,形成CH3S碎片.
  • 分离过程以75%的概率保留了母分子的形状.
  • S-S 断键反应坐标的表面对齐可能会导致形状保持.

结论:

  • 在Au(111) 上的CH3SSCH3的电子诱导解离保持了分子构造.
  • 保持形状的高概率归因于表面介导的反应动态.
  • 这项研究提供了对表面受控分子转换的见解.