氧化添加水,以新型的Ir(I) 复合物稳定由二甲基硫氧化物联体
Reto Dorta1, Haim Rozenberg, Linda J W Shimon
1Departments of Organic Chemistry and Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel.
Journal of the American Chemical Society
|January 10, 2002
概括
与二甲基硫氧化物 (DMSO) 的新型 (I) 复合物经过氧化添加水. 具有桥接氧联结体的新二维结构通过X射线晶体学进行了表征.
科学领域:
- 有机金属化学 有机金属化学
- 无机化学 无机化学
- 协调化学 协调化学
背景情况:
- 复合物是各种化学转换中的有价值的催化剂和前体.
- 了解与二甲基硫氧化物 (DMSO) 等联体的 (I) 复合物的反应性对于开发新的合成方法至关重要.
研究的目的:
- 为了合成和表征新型的含有DMSO配体的 (I) 复合物.
- 为了研究这些复合物的氧化添加水.
- 探索产生的产品的结构特征,包括二维结构和连接体结合模式.
主要方法:
- 合成 (I) 复合物,包括IrCl (DMSO) 3和[Ir (DMSO) 4]PF6.
- 复合物的与水的反应以诱导氧化添加.
- 使用X射线晶体学对产品的表征.
- 与皮里丁的联结物交换反应.
主要成果:
- 成功合成了IrCl (DMSO) 3 (1) 和它的二聚物 (Ir2Cl2 (DMSO)) (4) (2).
- 化[Ir(DMSO) ]4]PF6 (6) 的制备及其与水的反应产生二次产物3和7.
- 化合物1,3和7的X射线结晶学表征,揭示了具有桥接氧联结体的二维结构.
- 在复合体7中观察O和S结合的DMSO配体.
结论:
- 新型 ((I) DMSO复合物很容易经历氧化添加水.
- 由此产生的二维结构突出显示了桥接氧联结体在稳定物种中的作用.
- 这项研究提供了对复合体中DMSO配体的协调行为,包括潜在的S-结合的洞察.
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.
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...
Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
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: 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...
Hydration of Cement
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...


