anorganische strukturen und reaktionsmechanismen · the carbon of n-heterocyclic carbenes is very...
TRANSCRIPT
Anorganische Strukturen und Reaktionsmechanismen
Christoph Marschner
Institut für Anorganische ChemieTechnische Universität Graz
CHE.367
Literatur
• J. Huheey, E. Keiter, R. Keiter: Anorganische Chemie
• R.H. Crabtree: The Organometallic Chemistry of the Transition Metals
• J.P. Collman, L.S. Hegedus, J.R. Norton, R.G. Finke: Principles and
Applications of Organotransition Metal Chemistry
• J. Hartwig: Organotransition Metal Chemistry
Übersicht
• Struktur und Bindung von Komplexen
• Dative Liganden
CO
Phosphane und ähnliche
Carbene
Carbine
Olefine, Alkine, Arene
Neutrale N, O, S Liganden
σ-Komplexe: H2, R3SiH, Alkane
Carben Liganden
The carbon of N-heterocyclic carbenes is very soft and less electronegative than most heteroatom Lewis bases.
Relative to phosphanes carbene are stronger σ-donors, have stronger M-L bond strength and have two-foldsymmetry.
Aren Komplexe
Franz Hein, University of Leipzig, 1935
Vgl D. Seyferth: Organometallics 2002, 21, 1520 und Organometallics 2002, 21, 2800
Sigma Komplexe
The bonding between a metal and an X-H σ-bond is weaker
than the bonding between a metal and a π-bond, because the σ-bond is lower in energy and thus less basic while the σ*orbital is higher in energy and therefore less π-acidic.