Half-Sandwich Group 8 Borylene Complexes: Synthetic and Structural Studies and Oxygen Atom Abstraction Chemistry
作者:Glesni A. Pierce、Dragoslav Vidovic、Deborah L. Kays、Natalie D. Coombs、Amber L. Thompson、Eluvathingal D. Jemmis、Susmita De、Simon Aldridge
DOI:10.1021/om801215b
日期:2009.5.25
[CpRu(CO)2B(NCy2)}]+[BArf4]−, [CpM(CO)(PMe3)B(NCy2)}]+[BArf4]− (M = Fe, Ru), and [(CpFe(CO)B(NCy2)})2(μ-dmpe)]2+[BArf4]−2 have been synthesized and structurally characterized. The effects of substitution at the metal on the M−B and B−N bonds are relatively minor e.g., Fe−B and B−N bond lengths of 1.821(4), 1.347(5) Å and 1.859(6), 1.324(7) Å for [CpFe(CO)(PMe3)B(NCy2)}]+[BArf4]− and [CpFe(CO)2B(NCy2)}]+[BArf4]−
通过卤化物抽象合成的阳离子末端甲硼烷络合物提供了一个通用平台,可在该平台上评估由甲硼烷基取代基和金属/配体骨架的变化对金属-配体键的电子结构的影响。硼取代基对以硼为中心的亲电性有很大影响,因此对金属配体的π特性和键长也有很大的影响(例如[Cp * Fe(CO)2(BMes)] +从1.792(8)Å到2.049( 4)[CpFe(CO)2 B(NCy 2)(4-pic)}的Å ] +),则金属/配体组的变化会影响较小的变化。扩展卤化物提取方法很容易引入更强的π供体的含钌和/或膦的片段。通过在硼基前体阶段的羰基配体取代容易引入膦。因此,新型系统[CpRu(CO)2 B(NCy 2)}] + [BAr f 4 ] -,[CpM(CO)(PMe 3)B(NCy 2)}] + [BAr f 4 ] −(M = Fe,Ru)和[(CpFe(CO)B(NCy 2 }})2(μ-dmpe)] 2+