New Features of Bis(phosphinimine)-“carbene” Binding to RuII
摘要:
Analysis of the results of DFT(PBE) calculations on a variety of species containing a "RuC-(PPh2NPh)(2)" subunit led to the proposal that this should be considered as an example where an Ru/C single bond is present, which leaves a stereochemically active lone pair on the "carbene" carbon and thus a pyramidal, quasi-spa hybridization for carbon. General applications of this idea are discussed, the possible protonation of this carbon lone pair is described, and a DFT(PBE) geometry optimization of the two species (Cl)(n)RuHC(PPh2NPh)(2)((1-n)+) with n = 0, 1 reveals a potential for oxidative addition of the P/N bond of this ligand to Ru, to generate an RuNPh moiety. The crystal structure of the triflate (CF3SO3-) salt of the C-protonated species (Cymene)Ru[H*C(PPh2NPh](2)](+) shows that H* hydrogen bonds to triflate.