Palladium and Platinum Complexes of a Benzannulated N-Heterocyclic Plumbylene with an Unusual Bonding Mode

摘要

Reaction of the N'-diisobutyl-substituted benzannulated N-heterocydic plumbylene (NHPb) 1 with [Pd(PPh_3)_4] and [Pt(PPh_3)_4]gave the complexes [M(NHPb)(PPh_3)_3] (M = Pd [2], Pt [3]). X-ray diffraction studies of both complexes showed an angle of ~125° between the plumbylene plane and the transition-metal-Pb axis, indicating coordination of the transition metal to the empty 71 orbital of the plumbylene Pb atom. The experimentally determined metric parameters of complexes [2] and [3] are discussed on the basis of DFT calculations.