三坐标的Co (I) 提供了对不和二-Co (III) 和七坐标的Co (V) 的访问
Michael Ingleson1, Hongjun Fan, Maren Pink
1Department of Chemistry and Molecular Structure Center, Indiana University, Bloomington, IN 47405, USA.
Journal of the American Chemical Society
|February 9, 2006
概括
一个新的复合物PNPCo很容易与反应,形成三价化. 它还与西兰酸盐反应,产生一种独特的 ((V) 烯化合物,表现出新的反应性.
科学领域:
- 有机金属化学 有机金属化学
- 协调化学 协调化学
- 化学 化学
背景情况:
- 三坐标,T形 (I) 复合物由于其不和性而具有独特的反应性.
- 新型低价值过渡金属复合物的合成和表征对于理解基本化学转换至关重要.
研究的目的:
- 为了合成和表征一种新的三坐标,T形 (I) 复合体,PNPCo.
- 为了研究PNPCo与小分子如H2和初级西兰素的反应性.
- 探索复合体中不寻常的氧化状态和结合动机的形成.
主要方法:
- 通过降低PNPCoCl的PNPCo的合成.
- PNPCo与分子 (H2) 的反应.
- PNPCo与原始西兰 (PhSiH3) 的反应.
- 使用光谱和分析技术对产生的复合物的表征.
主要成果:
- 一个三重 (S=1) (I) 复合物的PNPCo成功合成.
- PNPCo经历了与H2的热可逆氧化添加,形成三价化,PNPCo(H) 2.
- 与多余的PhSiH3反应产生一个基稳定型基 ((V) 化合物, {kappa2-tBu2PCH2Me2SiNSiMe2CH2tBu2P(H) Si=}Co(H) 3(SiH2Ph) 2.
结论:
- 不和 (I) 复合物PNPCo对小分子表现出多样性的反应性.
- PNPCo促进了高价值物种和新型烯复合物的形成.
- 这项研究扩展了低价值复合物的已知化学和它们的转化.
更多相关视频
相关概念视频
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
![[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F12422.jpg&w=3840&q=75)
01:21[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
01:27Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.