期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2022, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202100903
关键词
Boron; Bridging ligands; Iron; Metallocenes; Ylides
资金
- Projekt DEAL
In this study, new ferrocene derivatives and complexes were synthesized and structurally characterized by single-crystal X-ray diffraction. Compounds 1 and 2 represent a new class of ferrocene-based bidentate ligands. Electrochemical investigation revealed the presence of three redox-active moieties in these compounds.
The 1,1 '-ferrocenylene (fc)-bridged bis(N-heterocyclic olefin) compounds (IMes=CH)(2)fc (1, IMes=1,3-dimesitylimidazolin-2-ylidene) and (IPr=CH)(2)fc (2, IPr=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) were synthesised from (ICH2)(2)fc (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.
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