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The slippage parameter A is defined as Δ = 1/2[(M-C1a + M-C3a) - (M-Cl+ M-C3)] where M-C1a and M-C3a are the longest distances between M and two adjacent C atoms of the Cp ring and M-C1 and M-C3 are the distances between M and the C atoms adjacent to C1a and C3a, respectively; in indenyl complexes C1a and C3a are the hinge C atoms.
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The slippage parameter A is defined as Δ = 1/2[(M-C1a + M-C3a) - (M-Cl+ M-C3)] where M-C1a and M-C3a are the longest distances between M and two adjacent C atoms of the Cp ring and M-C1 and M-C3 are the distances between M and the C atoms adjacent to C1a and C3a, respectively; in indenyl complexes C1a and C3a are the hinge C atoms.
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A pure η5 coordination, with five equivalent metal-C bonds, is not observed even in Cp derivatives: slippage of the ML2 unit occurs, accompanied by folding of the ring: Albright, T. A, Burdett, J. K, Whangbo, M.-H. Orbital Interactions in Chemistry; Wiley: New York, 1985. In Ind complexes, the η5 bonding mode is a distorted η3+η2 bonding mode. In fact, the nodal properties of the Ind π system introduce an asymmetry that is not present in the Cp π orbitais: Calhorda, M. J, Veiros, L. F. Coord. Chem. Rev. 1999, 185-186, 37. In addition slippage toward a more allylic coordination in Ind complexes favors the aromatic character of the benzene ring. As a consequence, the two bonds of the metal to the hinge carbons are longer and weaker and both the slippage parameter and the folding angle of the five-membered ring are more pronounced in Ind complexes than in the analogous Cp complexes. These
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2 bonding mode. In fact, the nodal properties of the Ind π system introduce an asymmetry that is not present in the Cp π orbitais: Calhorda, M. J.; Veiros, L. F. Coord. Chem. Rev. 1999, 185-186, 37. In addition slippage toward a more allylic coordination in Ind complexes favors the aromatic character of the benzene ring. As a consequence, the two bonds of the metal to the hinge carbons are longer and weaker and both the slippage parameter and the folding angle of the five-membered ring are more pronounced in Ind complexes than in the analogous Cp complexes. These structural features are commonly invoked to explain the higher reactivity of Ind complexes than Cp complexes ("indenyl effect").
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