Syntheses, Properties, and X-ray Crystal Structures of Piano-Stool Iron Complexes Bearing an N-Heterocyclic Carbene Ligand

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• 作者：Philipp Buchgraber ; Loï ; c Toupet ; and Vé ; ronique Guerchais
• 刊名：Organometallics
• 出版年：2003
• 出版时间：November 24, 2003
• 年：2003
• 卷：22
• 期：24
• 页码：Buchgraber, Loïc
• 全文大小：87K
• 年卷期：v.22,no.24(November 24, 2003)
• ISSN：1520-6041

文摘

Piano-stool iron complexes containing theC-C unsaturated IMes or saturated H₂-IMes ligand arereadily synthesized from [CpFe(CO)₂(I)]. Substitution ofthe iodide ligand affords the cationic species [CpFe(CO)₂(L)][[I] (1a⁺I^-) and (1b⁺I^-) (a, L = IMes, b, L = H₂-IMes), subsequent decarbonylation of which yields theneutral iodo derivatives 2a,b. Cyclic voltammetry studiesof 2a,b show a reversible one-electron oxidation to thecorresponding 17-electron radical cation. The mono(acetonitrile) complexes 3a,b are obtained from UVirradiation of 1a,b⁺PF₆^- in CH₃CN, but displacementof the second CO ligand is inhibited by strong metal-CO -back-donation.