An unprecedented bonding mode for potassium within a PCP-pincer palladium hydride-K-Selectride~R complex

摘要

The reaction of(PCP)~(i-Pr)PdCl and the commonly-used reductant K-Selectride~R solution[K(sec-Bu3BH)in THF]does not yield a simple(PCP)~(i-Pr)PdH species,but rather an adduct of the Pd-H that contains bound K(sec-Bu3BH).This adduct has been characterized by X-ray crystallography and shown to be a centrosym-metric dimer in the solid state.The most unique feature of the structure is that the tri-coordinate K~+ion bonds only to the terminal palladium hydride and the two bridging boron hydrides.Despite being prepared in THF,no other donor ligands are bound to K~+.This[H3K]~+bonding mode for K~+ions has not been previously reported.