1,1′-Ferrocenylene-Bridged Bis(N-Heterocyclic Olefin) Derivatives
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In: EurJIC (European Journal of Inorganic Chemistry) 2022 / Issue 2 (2021-10-18) , S. ; eissn:1099-0682
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The 1,1′-ferrocenylene (fc)-bridged bis(N-heterocyclic olefin) compounds (IMes=CH)₂fc (1, IMes=1,3-dimesitylimidazolin-2-ylidene) and (IPr=CH)₂fc (2, IPr=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) were synthesised from (ICH₂)₂fc (3) and the respective N-heterocyclic carbene IMes or IPr. Ligand substitution reactions of 1 and 2 with [BH₃(THF)] afforded the complexes [1(BH₃)₂] and [2(BH₃)₂] as mixtures of the rac- and meso-diastereomers. The new ferrocene derivatives 1–3 and the complexes meso-[1(BH₃)₂], rac-[1(BH₃)₂] and rac-[2(BH₃)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.
@article{doi:10.17170/kobra-202201175556, author ={Guthardt, Robin and Mellin, Johanna and Bruhn, Clemens and Siemeling, Ulrich}, title ={1,1′-Ferrocenylene-Bridged Bis(N-Heterocyclic Olefin) Derivatives}, keywords ={540 and Bor and Überbrückte Verbindungen and Eisen and Metallocene and Ylide}, copyright ={http://creativecommons.org/licenses/by/4.0/}, language ={de}, journal ={EurJIC (European Journal of Inorganic Chemistry)}, year ={2021-10-18} }