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Theoretical investigation of the electronic structure of the mixed-sandwich complex (h5-cyclopentadienyl)(h6-benzene)iron and its cation

Le Beuze, A.
Lissillour, Roland
Published in Organometallics. 1993, vol. 12, no. 1, p. 47-55
Abstract SCF MS-Xa calculations have been carried out for the d6 [(Cp)Fe(Bz)]+ (1) and d7 (Cp)- Fe(Bz) (2) compounds (Cp = q5-cyclopentadienyl, Bz = +benzene), and the results are compared with those previously reported for metallocenes Fe(Cp)2 (3), Co(Cp)z (4), [Ni(Cp)2]+ (6), and d8 Ni(Cp)z (6) using the same technique. Analysis of the electronic structure of 1 and 2 shows that whereas Cp and Bz ligands play roughly the same role in digand to metal donation, they behave differently as far as 3d6 back-donation is concerned, the Bz system having a much more important role in this case. This is confirmed by spin-polarized (SP) calculations performed for 2 and 4, which show that the 3d6 orbitals exhibit a much larger interaction with the Bz ligand than with the Cp group. In addition, a considerable charge relaxation occurs at the metal upon ionization of 2, as the gross charges on the iron are roughly the same in 1 and 2. When using the MS-Xa results to calculate spectroscopic properties, a good agreement is found between theoretical and experimental results determined for both the electron field gradient (EFG) at the metal nucleus and Mossbauer isomer shift (IS) for compounds 1-3. Similarly, both MS-Xa ionization and electronic excitation energies calculated for 1 and 2 compare fairly well with photoelectron and UV-visible absorption data.
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Research group Groupe Weber
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LE BEUZE, A., LISSILLOUR, Roland, WEBER, Jacques. Theoretical investigation of the electronic structure of the mixed-sandwich complex (h5-cyclopentadienyl)(h6-benzene)iron and its cation. In: Organometallics, 1993, vol. 12, n° 1, p. 47-55. https://archive-ouverte.unige.ch/unige:2903

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Deposited on : 2009-09-21

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