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• 作者：Fabrizia Fabrizi de Biani ; Gabriele Manca ; Lorella Marchetti ; Piero Leoni ; Samantha Bruzzone ; Carla Guidotti ; Andrea Atrei ; Alberto Albinati ; Silvia Rizzato
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：November 2, 2009
• 年：2009
• 卷：48
• 期：21
• 页码：10126-10137
• 全文大小：1096K
• 年卷期：v.48,no.21(November 2, 2009)
• ISSN：1520-510X

文摘

The reaction between Pt₃(μ-PBu^t₂)₃(CO)₂Cl (2) and ethynylferrocene, in the presence of catalytic amounts of CuI, gives Pt₃(μ-PBu^t₂)₃(CO)₂C≡CFc (1), characterized by X-ray crystallography and representing a rare example of the σ-coordination of an alkynyl moiety to a cluster unit. In a dichloromethane (CH₂Cl₂) solution, compound 1 undergoes three consecutive one-electron oxidations, the first of which is assigned to the ferrocene-centered Fe^II/Fe^III redox couple. Spectroelectrochemistry, carried out on a solution of 1, shows the presence of a broad band in the near-IR region, growing after the electrochemical oxidation, preliminarily associated with a metal-to-metal charge transfer toward the Fe^III ion of the ferrocenium unit. Density functional theory (DFT) has been employed to analyze the ground- and excited-state properties of 1 and 1⁺, both in the gas phase and in a CH₂Cl₂ solution. Vertical excitation energies have been computed by the B3LYP hybrid functional in the framework of the time-dependent DFT approach, and the polarizable continuum model has been used to assess the solvent effect. Our results show that taking into account the medium effects together with the choice of an appropriate molecular model is crucial to correctly reproducing the excitation spectra of such compounds. Indeed, the nature of the substituents on P atoms has been revealed to have a key role in the quality of the calculated spectra.