摘要:
Two homoleptic Yb-II constrained geometry complexes [Yb{eta(5),eta(1)-R2P(C5Me4)NAd}(2)] [R = Me (3), Ph (4): Ad = 1-adamantyl] derived from P-amino(cyclopentadienylidene)phosphoranes (CpPN) R2P(C5Me4)NHAd [R = Me (1), Ph (2)] were found to be remarkably stable towards dioxygen, as shown by NMR spectroscopy and further confirmed by the crystal structure analysis of 4 and discussed in terms of efficient steric shielding and electronic stabilization of the Yb-II metal centre by this CpPN ligand type.