Experimental and Theoretical Studies of Bonding and Oxidative Addition of Germanes and Silanes, EH4-nPhn (E = Si, Ge; n = 0−3), to Mo(CO)(diphosphine)2. The First Structurally Characterized Germane σ Complex
| Autor: | Agustí Lledós, Jean L. Vincent, Gregory J. Kubas, Carol J. Burns, Jaume Tomàs, Steven Luo, Ray Butcher, Feliu Maseras, Clifford J. Unkefer, Brian L. Scott |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Organometallics. 22:5307-5323 |
| ISSN: | 1520-6041 0276-7333 |
| Popis: | Reaction of GeH4 and GeH3Ph with the agostic complex Mo(CO)(dppe)2 (dppe = Ph2PC2H4PPh2) provides germane σ complexes Mo(CO)(η2-GeH4-nPhn)(dppe)2 (n = 0, 1). The coordination in these complexes has been assigned as (η2-Ge−H) on the basis of NMR and IR spectroscopy and by comparison to the analogous complexes of silanes. When the more electron-rich phosphine depe (depe = Et2PC2H4PEt2) is used, oxidative addition (OA) products MoH(GeH3)(CO)(depe)2 and MoH(GeH2Ph)(CO)(depe)2 are isolated (NMR and X-ray evidence). However, when the secondary organogermane GeH2Ph2 is used in the depe system, the η2-complex Mo(CO)(η2-GeH2Ph2)(depe)2 is obtained. This complex was characterized by X-ray crystallography and NMR and IR spectroscopy. The Mo(CO)(η2-GeH3Ph)(dppe)2 and Mo(CO)(η2-GeH2Ph2)(depe)2 complexes were found to be in tautomeric equilibrium with their OA products in solution. Structure and bonding comparisons are made to the analogous silane complexes, e.g., Mo(CO)(η2-SiH2Ph2)(depe)2, the X-ray structure for whic... |
| Databáze: | OpenAIRE |
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