A “Push–Pull” Stabilized Phosphinidene Supported by a Phosphine‐Functionalized β‐Diketiminato Ligand
Sebastian Bestgen, Meera Mehta, Timothy C. Johnstone, Peter W. Roesky, José M. Goicoechea
Abstract
Abstract The use of a bis(diphenyl)phosphine functionalized β‐diketiminato ligand, [HC{(CH 3 )C} 2 {( ortho ‐[P(C 6 H 5 ) 2 ] 2 C 6 H 4 )N} 2 ] − (PNac), as a support for germanium(II) and tin(II) chloride and phosphaketene compounds, is described. The conformational flexibility and hemilability of this unique ligand provide a versatile coordination environment that can accommodate the electronic needs of the ligated elements. For example, chloride abstraction from [(PNac)ECl] (E=Ge, Sn) affords the cationic germyliumylidene and stannyliumylidene species [(PNac)E] + in which the pendant phosphine arms associate more strongly with the Lewis acidic main group element centers, providing further electronic stabilization. In a similar fashion, chemical decarbonylation of the germanium phosphaketene [(PNac)Ge(PCO)] with tris(pentafluorophenyl)borane affords a “push–pull” stabilized phosphinidene in which one of the phosphine groups of the ligand backbone associates with the low valent phosphinidene center.