Novel 2,2′-bipyridine containing two (η2-dppe)(η5-C5Me5)Fe-C[triple bond, length as m-dash]C- redox-active units with an exceptionally spatially demanding substitution pattern - Université de Rennes Accéder directement au contenu
Article Dans Une Revue New Journal of Chemistry Année : 2011

Novel 2,2′-bipyridine containing two (η2-dppe)(η5-C5Me5)Fe-C[triple bond, length as m-dash]C- redox-active units with an exceptionally spatially demanding substitution pattern

Résumé

Synthetic approaches to 6,6′-disubstituted-2,2′-bipyridine ligands bearing two redox active (η2-dppe)(η5-C5Me5)Fe-C[triple bond, length as m-dash]C- moieties are described. The target complex 6,6′-{(η2-dppe)(η5-C5Me5)Fe-C[triple bond, length as m-dash]C}2(2,2′-bipyridine) (6) was obtained in 79% yield as an orange powder from the reaction between the iron chloride (η2-dppe)(η5-C5Me5)Fe-Cl (9) and the 6,6′-bis(trimethylsilylethynyl)-2,2′-bipyridine (14) in the presence of KF and KPF6 in a 3 : 1 methanol/THF mixture. When reacted with 2 equiv. of [(C5H5)2Fe][PF6], 6 provided the stable bis-iron(III) complex 6[PF6]2 in 89% yield which was characterized by an X-ray crystal structure. The substitution pattern of the novel metallo-ligand 6 is so spatially demanding that it does not react with CuCl, [Cu(CH3CN)4][PF6] and PtCl2, even in drastic conditions. Nevertheless, compound 6 reacts smoothly with ZnCl2 to provide the zinc adduct ZnCl2(6), the spectroscopic properties of which evidence the Lewis acidic character of zinc dichloride.
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Dates et versions

hal-00738760 , version 1 (05-10-2012)

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Frederic Justaud, Thierry Roisnel, Claude Lapinte. Novel 2,2′-bipyridine containing two (η2-dppe)(η5-C5Me5)Fe-C[triple bond, length as m-dash]C- redox-active units with an exceptionally spatially demanding substitution pattern. New Journal of Chemistry, 2011, 35 (10), pp.2219-2226. ⟨10.1039/C1NJ20269C⟩. ⟨hal-00738760⟩
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