Stabilization of Unsolvated Europium and Ytterbium Pentafluorophenyls by π-Bonding Encapsulation through a Sterically Crowded Triazenido Ligand

The one-pot transmetalation/deprotonation reaction of the bulky triazene Dmp(Tph)N₃H with bis(pentafluorophenyl)mercury and europium or ytterbium affords the structurally characterized unsolvated metal(II) pentafluorophenyl triazenides [Dmp(Tph)N₃MC₆F₅] (M = Eu, Yb; Dmp = 2,6-Mes₂C₆H₃ with Mes = 2,4,6-Me₃C₆H₂; Tph = 2-TripC₆H₄ with Trip = 2,4,6-ⁱPr₃C₆H₂) or, depending on the molar ratio, the solvated complex [Dmp(Tph)N₃YbC₆F₅(THF)].