Synthesis, structure and spectroelectrochemistry of bis(η6
-1,4-tri-tert-butyl-benzene)chromium(0) and bis(η5
-1,2,4-tri-tert-butyl-cyclopentadienyl)cobalt(II). Dia- and paramagnetic 
sandwich complexes derived from sterically highly demanding π-ligands

Schneider, Jörg J.; Czap, Norbert; Spickermann, Dirk; Lehmann, Christian W.; Fontani, Marco; Laschi, Franco; Zanello, Piero

doi:10.1016/S0022-328X(99)00383-6

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Synthesis, structure and spectroelectrochemistry of bis(η⁶-1,4-tri-tert-butyl-benzene)chromium(0) and bis(η⁵-1,2,4-tri-tert-butyl-cyclopentadienyl)cobalt(II). Dia- and paramagnetic sandwich complexes derived from sterically highly demanding π-ligands

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Lehmann, Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Schneider, J. J., Czap, N., Spickermann, D., Lehmann, C. W., Fontani, M., Laschi, F., et al. (1999). Synthesis, structure and spectroelectrochemistry of bis(η⁶-1,4-tri-tert-butyl-benzene)chromium(0) and bis(η⁵-1,2,4-tri-tert-butyl-cyclopentadienyl)cobalt(II). Dia- and paramagnetic sandwich complexes derived from sterically highly demanding π-ligands. Journal of Organometallic Chemistry, 590(1), 7-14. doi:10.1016/S0022-328X(99)00383-6.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-5CDD-3

Abstract

Metal atom synthesis gives access to the bis(arene)chromium sandwich of 1,4 di-tert-butyl-benzene (5). 5 displays an axial sandwich structure with a linear arene–chromium–arene axis and a Cr–arene distance of 1.64 Å. Reduction of [{(η⁵-1,2,4 tri-tert-butyl-Cp)CoCl}₂] with the trianion of decacyclene in THF produces the cobaltocene sandwich [(η⁵-1,2,4 tri-tert-butyl Cp)
₂Co] 2 as black crystals in 65% yield. Electrochemistry shows that the monocations 2⁺ and 5⁺ are able to support reversibly the one-electron reduction to their corresponding neutral congeners.