The 1,1'-ferrocenylene (fc)-bridged bis(N-heterocyclic olefin) compounds (IMes=CH) 2 fc (1, IMes = 1,3-dimesitylimidazolin-2ylidene) and (IPr=CH) 2 fc (2, IPr = 1,3-bis(2,6diisopropylphenyl)imidazolin-2-ylidene) were synthesised from (ICH 2 ) 2 fc (3) and the respective N-heterocyclic carbene IMes or IPr. Ligand substitution reactions of 1 and 2 with [BH 3 (THF)] afforded the complexes [1(BH 3 ) 2 ] and [2(BH 3 ) 2 ] as mixtures of the rac-and meso-diastereomers. The new ferrocene derivatives 1-3 and the complexes meso-[1(BH 3 ) 2 ], rac-[1(BH 3 ) 2 ] and rac-[2(BH 3 ) 2 ] were structurally characterised by single-crystal X-ray diffraction. 1 and 2 represent a new class of ferrocene-based, and hence redox-active, bidentate ligands. The presence of three redox-active moieties, viz. the ferrocene unit and the two NHO units, is reflected by three consecutive oxidations according to an electrochemical investigation exemplarily performed with 2 by cyclic voltammetry.
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