金属原子之间的易斯酸相互作用及其用于合成双金属集群复合物的应用
Richard D Adams1, Burjor Captain, Wei Fu
1Department of Chemistry and Biochemistry, University of South Carolina Columbia, South Carolina 29208, USA. adams@mail.chem.sc.edu
Journal of the American Chemical Society
|May 16, 2002
概括
通过将碎片添加到碳化合物中,合成了新的-集群复合物. 这些新的复合体展示了独特的桥梁结构跨越 - 键,扩大有机金属化学.
科学领域:
- 有机金属化学 有机金属化学
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
背景情况:
- 碳基复合物是集群化学的基础.
- 复合物为修改金属集群提供了独特的反应性.
- 了解金属-金属键相互作用对于催化和材料至关重要.
研究的目的:
- 为了合成新的 - 集群复合物.
- 调查这些新添加物的结构特征.
- 为了探索碎片与碳基团的反应性.
主要方法:
- 双 (di-tert-butylphosphino) (palladium) (Pd) (PBu) (t) (3)) (2)) 与鲁碳烯基前体的反应.
- 合成三二添加物与Ru(3)(CO)(12).
- 合成二二附加物与Ru(6) ((CO) ((17) ((C) 和Ru(2) ((CO) ((9).
主要成果:
- 形成三二添加物Ru(3) ((CO) ((12) [Pd(PBu(t) ((3)) ](3) ,其中Pd片段是Ru-Ru键的桥梁.
- 隔离两种二 adduct Ru ((6) (((CO) ((17) ((C) ((Pd (((PBu ((t) ((3)))))) 的异构体,具有不同的桥接模式.
- 从一个不稳定的二鲁前体中合成二二二复合体Ru(2)(CO)(9)[Pd(PBu(t)(3))](2).
结论:
- 成功制备了新的 - 集群复合体.
- 证明了Pd(PBu(t) ((3)) 碎片在各种碳基团中桥接Ru-Ru键的能力.
- 突出了可以通过复合物与碳酸的反应来实现的结构多样性.
相关概念视频
Ionic Bonding and Electron Transfer
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Bonding in Metals
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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...
Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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...


