Zusammenfassung
Verbindungen, welche die Strukturelemente enthalten, liegen im Bereich zwischen den Komplexen reiner σ-Donor-Liganden (ÜM-Alkyle) und der großen Klasse der σ-Donor/π-Akzeptor-Komplexe (L = CO, Isocyanid, Phosphan etc.). Zwar verfügen Alkenyl-, Alkinyl- und Arylreste über unbesetzte.π*-Orbitale, die im Prinzip in der Lage sein sollten, mit besetzten Metall(d)-Orbitalen in Wechselwirkung zu treten, jedoch scheint einer M→C π-Rückbindung hier nur geringe Bedeutung zuzukommen. Ein Hinweis auf eine solche wäre eine M-C-Bindungslänge, welche die Summe der Einfachbindungs-Kovalenzradien der beteiligten Atome unterschritte.
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Elschenbroich, C. (2003). σ-Donor/π-Akzeptor-Liganden. In: Organometallchemie. Teubner Studienbücher Chemie. Vieweg+Teubner Verlag, Wiesbaden. https://doi.org/10.1007/978-3-322-99393-9_14
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