期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 2, 页码 197-216出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200900966
关键词
Main group elements; Metal-metal interactions; Subvalent compounds; Alkaline earth metals; Cluster compounds; Arene ligands; Radical anions
资金
- Deutsche Forschungsgemeinschaft (DFG. Bonn-Bad Godesberg, Germany)
- Schweizer Nationalfonds (SNF, Berne, Switzerland)
- Fonds der Chemischen Industrie (Frankfurt/Main. Germany)
- Verband der Chemischen Industrie (VCI/FCI)
Alkaline earth metals (Ae) are regarded as redox-inactive, and their chemistry is dominated by the oxidation state +2. Nevertheless, in recent years several Compound classes with alkaline earth metals in low oxidation states were investigated. Various concepts proved to be valid for the stabilization of such compounds and are discussed in this review. In the solid state, subvalency can be achieved by offering a matrix that takes over the excess electrons as, for example, in subnitrides. This fact leads to normal-valent alkaline earth metals with electrons free to move between alkaline-earth-metal-containing cages with or without a metal matrix. Another concept focuses on the synthesis of [Ae(2)](2+) cations with adequate substituents. The homodinuclear Ae-Ae bonds exhibit binding energies that should allow the synthesis of molecules Such as R-Ae-Ae-R. The synthesis of magnesium derivatives succeeded by use of extremely bulky bidentate ligands with a delocalized anionic charge. The heavier alkaline earth metal derivatives are investigated by quantum chemical methods. Another possibility takes advantage of the fact that the first and second ionization potentials of the alkaline earth metals are clearly separated. Therefore, an arene with an extended pi-system having an energy level between the two ionization potentials should be able to overtake only one electron, which leads to Ae(+) cations, Sophisticated procedures allowed the synthesis of a calcium(l) derivative, [(thf)(3)Ca(mu-eta(6),eta(6)-C6H3-1,3,5-Ph-3)Ca(thf)(3)}, and such structures are investigated by quantum chemical methods also for the other alkaline earth metals.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据