Radical‐Bridged Ln<sub>4</sub> Metallocene Complexes with Strong Magnetic Coupling and a Large Coercive Field
Niki Mavragani, Dylan Errulat, Diogo A. Gálico, Alexandros A. Kitos, Akseli Mansikkamäki, Muralee Murugesu
Abstract
Abstract Inducing magnetic coupling between 4 f elements is an ongoing challenge. To overcome this formidable difficulty, we incorporate highly delocalized tetrazinyl radicals, which strongly couple with f ‐block metallocenes to form discrete tetranuclear complexes. Synthesis, structure, and magnetic properties of two tetranuclear [(Cp* 2 Ln) 4 (tz . ) 4 ]⋅3(C 6 H 6 ) (Cp*=pentamethylcyclopentadienyl; tz=1,2,4,5‐tetrazine; Ln=Dy, Gd) complexes are reported. An in‐depth examination of their magnetic properties through magnetic susceptibility measurements as well as computational studies support a highly sought‐after radical‐induced “giant‐spin” model. Strong exchange interactions between the Ln III ions and tz . radicals lead to a strong magnet‐like behaviour in this molecular magnet with a large coercive field of 30 kOe.