Coordination Chemistry of N-Heterocyclic Stannylenes: A Combined Synthetic and Mo虉ssbauer Spectroscopy Study

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• 作者：Stephen M. Mansell ; Rolfe H. Herber ; Israel Nowik ; Douglas H. Ross ; Christopher A. Russell ; Duncan F. Wass
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：March 21, 2011
• 年：2011
• 卷：50
• 期：6
• 页码：2252-2263
• 全文大小：1134K
• 年卷期：v.50,no.6(March 21, 2011)
• ISSN：1520-510X

文摘

The N-heterocyclic stannylenes (NHSns), [(Dipp)N(CH₂)_nN(Dipp)Sn] (Dipp = 2,6- ⁱPr₂C₆H₃; n = 2, 1; n = 3, 5) and [(^tBu)N(CHMe)₂N(^tBu)Sn] (10) are competent ligands toward a variety of transition metal centers, as seen in the complexes [W(CO)₅路1] (2), [(OC)₄Fe(渭-1)₂Fe(CO)₄] (3), [(OC)₄Fe(渭-1)Fe(CO)₄] (4), [Fe(CO)₄路5]_n (6, n = 1 or 2), [(OC)₄Fe(渭-5)Fe(CO)₄] (7), [Ph₃PPt(渭-1)₂PtPPh₃] (8), [Fe(CO)₄路10] (11), and [(畏⁵-C₅H₅)(OC)₂Mn路10] (12). X-ray crystallographic studies show that the NHSns are structurally largely unperturbed binding to the metal, but in contrast to the parent NHCs, NHSns often adopt a bridging position across dinuclear metal units. The balance between terminal and bridging positions for the stannylene is evidently closely balanced as shown by the observation of both monomers and dimers for 6 in the solid state and in solution. ¹¹⁹Sn and ⁵⁷Fe M枚ssbauer spectroscopy of the complexes shows the tin atoms in such complexes to be consistent with electron deficient Sn(II) centers.