分离电子附着和Ar+反应与六碳,296-400K
Thomas M Miller1, Virginia G Rodriguez2, Shaun G Ard2
1Boston College Institute for Scientific Research, Boston, Massachusetts 02549, USA.
The Journal of chemical physics
|September 25, 2024
概括
测量了六碳 [Cr(CO) 6 的离散电子附着速率常数. 该研究发现2.92 ± 0.70cm3s-1的速度常数在296K,在更高的温度下略有下降.
科学领域:
- 物理化学 物理化学
- 化学物理 化学物理
- 气相离子化学 气相离子化学
背景情况:
- 六碳[Cr(CO) 6]是一种挥发性的金属有机化合物.
- 了解电子分子相互作用对于各种化学过程至关重要.
研究的目的:
- 为了测量离散电子附着到Cr (Cr) 6.CO (CO) 6.0 的速率常数.
- 调查这些速率常数的温度依赖性.
- 为了识别Ar+与Cr (CO) 6.6反应中的阴离子产物.
主要方法:
- 电子附着速率常数的实验测量使用流动后发光兰迈尔探针 (FALP) 技术.
- 温度控制的实验范围从296K到400K.
- 质谱测量用于识别来自离子-分子反应的离子产物.
主要成果:
- 对Cr (CO) 6的离散电子附着会产生Cr (CO) 5离子.
- 在296 K的速度常数被确定为2.92 ± 0.70 cm3 s-1.
- 随着温度的增加,观察到速率常数略有下降,降至400 K的2.72 ± 0.70 cm3 s-1.
- 还确定了与Cr(CO) 6发生Ar+反应产生的离子产物.
结论:
- 这项研究提供了电子与Cr(CO) 6.6相互作用的关键动态数据.
- 观察到的温度依赖性为反应机制提供了洞察力.
- 鉴定阴离子产物有助于全面了解Cr(CO) 6的反应性.
相关概念视频
00:54Radical Formation: Homolysis
3.5K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.5K
01:11Radical Reactivity: Overview
2.1K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.1K
00:47Radical Formation: Addition
1.7K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.7K
01:17Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene
5.5K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
5.5K
02:37Oxidation of Alcohols
12.8K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
12.8K
02:38Electrophilic Addition to Alkynes: Halogenation
8.2K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.2K