合成和金属离子结合性质的(III) 三乙化物复合物
Louise A Berben1, Jeffrey R Long
1Department of Chemistry, University of California, Berkeley, California 94720-1460.
Journal of the American Chemical Society
|September 26, 2002
概括
一种新型的 (III) 三甲基化物复合物被合成为金属二碳化物集群的前体. 这种稳定于空气中的化合物具有独特的结构,对材料科学有影响.
科学领域:
- 无机化学 无机化学 有机化学
- 有机金属化学 有机金属化学
- 材料科学 材料科学 材料科学
背景情况:
- 复合物在催化和材料科学中至关重要.
- 开发先进材料的前体,如金属二碳化物集群是一个活跃的研究领域.
- 乙化物联体在协调化学中提供独特的结合和反应性.
研究的目的:
- 为了合成一种新型的 (III) 三乙酸复合物.
- 为了研究其结构性,粘合性和磁性特性.
- 探索其作为金属二碳化物集群的前体的潜力.
主要方法:
- 通过与trimethylsilylacetylide反应合成(III) 三乙复合物.
- 使用X射线晶体学进行表征.
- 对磁性质的研究.磁性质的研究.
主要成果:
- 一种前所未有的稳定于空气的色 (III) 三化物复合物[Me (III) ) (Cr (CCH) (III)) ],已成功合成.
- X射线晶体学揭示了在中心周围的八面体协调,具有类似于乙的线性Cr-CC键.
- 具有K(+) 和Cs(+) 离子的复合体显示出Cr(III) 中心之间的侧向协调和弱反铁磁交换.
结论:
- 合成的 (III) 三甲基化物复合物是潜在的金属二碳化物集群的稳定前体.
- 结构和磁性特性提供了关于复合体中乙化物联体的结合的见解.
- 这项工作为设计具有定制电子和磁性特性的新材料开辟了道路.
相关概念视频
Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Metal-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...
Structural 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...
Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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