Bent metallocene complexes
المؤلف:
Peter Atkins, Tina Overton, Jonathan Rourke, Mark Weller, and Fraser Armstrong
المصدر:
Shriver and Atkins Inorganic Chemistry ,5th E
الجزء والصفحة:
ص563-564
2025-10-04
261
Bent metallocene complexes
Key point: The structures of bent sandwich compounds can be systematized in terms of a model in which three metal atom orbitals project towards the open face of the bent Cp2 M fragment. In addition to the simple bis(cyclopentadienyl) and bis(arene) complexes with parallel rings, there are many related structures. In the jargon of this area, these species are referred to as ‘bent sandwich compounds’ (72), ‘half-sandwich’ or ‘piano stool’ compounds (73), and, inevitably, ‘triple deckers’ (74). Bent sandwich compounds play a major role in the
Figure 22.14 (a) The fluxional process in [Ge(η1-Cp) (Me)3] occurs by a series of 1,2-shifts. (b) The fluxionality of [Ru(η4-C8H8) (CO)3] can be described similarly. We need to imagine that the Ru atom is out of the plane of the page with the CO ligands omitted for clarity.
organometallic chemistry of the early and middle d-block elements, and examples include [Ti(5-Cp)2Cl2], [Re(5-Cp)2 Cl], [W(5-Cp)2(H)2], and [Nb(5-Cp)2Cl3]. As shown in Fig. 22.15, bent sandwich compounds occur with a variety of electron counts and stereochemistries. Their structures can be systematized in terms of a model in which three metal atom orbitals project out of the open face of the bent M(Cp)2 fragment. According to this model, the metal atom often satisfies its electron deficiency when the electron count is less than 18 by interaction with lone pairs or agostic C-H groups on the ligands.
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