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• W2086376616 endingPage "1268" @default.
• W2086376616 startingPage "1251" @default.
• W2086376616 abstract "Experimental charge densities for (C5H5)Mn(CO)3 (2), (η6-C6H6)Cr(CO)3 (3), and (E)-{(η5-C5H4)CF═CF(η5-C5H4)}(η5-C5H5)2Fe2 (4) have been obtained by multipole refinement of high-resolution X-ray diffraction data at 100 K. The resultant densities were analyzed using the quantum theory of atoms in molecules (QTAIM). The electronic structures of these and related π-hydrocarbyl complexes have also been studied by ab initio density functional theory calculations, and a generally good agreement between theory and experiment with respect to the topological parameters was observed. The topological parameters indicate significant metal−ring covalency. A consistent area of disagreement concerns the topology of the metal−ring interactions. It is shown that because of the shared-shell bonding between the metal and the ring carbons, an annulus of very flat density ρ and very small ▽ρ is formed, which leads to topologically unstable structures close to catastrophe points. This in turn leads to unpredictable numbers of metal−C bond paths for ring sizes greater than four and fewer M−C bond paths than expected on the basis of the formal hapticity. This topological instability is a general feature of metal−π-hydrocarbyl interactions and means that a localized approach based on individual M−Cring bond paths does not provide a definitive picture of the chemical bonding in these systems. However, other QTAIM indicators, such as the virial paths, the delocalization indices, and the source function, clearly demonstrate that for the n-hapto (ηn-CnHn)M unit, there is generally a very similar level of chemical bonding for all M−Cring interactions, as expected on the basis of chemical experience." @default.
• W2086376616 created "2016-06-24" @default.
• W2086376616 creator A5060787706 @default.
• W2086376616 creator A5073087506 @default.
• W2086376616 creator A5083617813 @default.
• W2086376616 creator A5087164695 @default.
• W2086376616 date "2008-12-22" @default.
• W2086376616 modified "2023-10-16" @default.
• W2086376616 title "The QTAIM Approach to Chemical Bonding Between Transition Metals and Carbocyclic Rings: A Combined Experimental and Theoretical Study of (η⁵-C₅H₅)Mn(CO)₃, (η⁶-C₆H₆)Cr(CO)₃, and (<i>E</i>)-{(η⁵-C₅H₄)CF═CF(η⁵-C₅H₄)}(η⁵-C₅H₅)₂Fe₂" @default.
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