A New Geometry for Homoleptic Organochromium Compounds

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• 作者：Pablo J. Alonso ; Juan Fornié ; s ; M. Angeles Garc&iacute ; a-Monforte ; Antonio Mart&iacute ; n ; and Babil Menjó ; n
• 刊名：Organometallics
• 出版年：2005
• 出版时间：March 14, 2005
• 年：2005
• 卷：24
• 期：6
• 页码：1269 - 1274
• 全文大小：115K
• 年卷期：v.24,no.6(March 14, 2005)
• ISSN：1520-6041

文摘

[NBu₄]₂[Cr(C₆F₅)₅] (1) has been obtained by low-temperature treatment of [CrCl₃(THF)₃]with LiC₆F₅. The five-coordinate anion [Cr(C₆F₅)₅]^2- has been found to be square pyramidalby X-ray diffraction methods. The SPY-5 geometry is unprecedented for homolepticorganochromium compounds. EPR data for this paramagnetic S = 3/2 system (d³ electronconfiguration) point to the existence of two types of Cr^III centers with very similar coordinationenvironments. A comparison with the titanium(III) isoleptic species [Ti(C₆F₅)₅]^2- allows usto conclude that the fact that [Cr(C₆F₅)₅]^2- in 1 adopts a SPY-5 structure must be due toelectronic reasons associated with the electron configuration of the metal center.