Beyond Kahn's Model: Substituent and Heteroatom Influence on Exchange Interaction in a Metal‐Verdazyl Complex

Abstract

Abstract The synthesis, structure and magnetic properties of the first thiooxoverdazyl metal complex [Cu(hfac) 2 (Svdpy)] [hfac = (1,1,1,5,5,5)‐hexafluoroacetylacetonate; Svdpy = 1,5‐dimethyl‐3‐(2‐pyridyl)‐6‐thiooxoverdazyl] is described. The organic radical acts as a bidentate ligand leading to a six‐coordinate metal complex. The fit of the thermal variations of the magnetic susceptibility reveal a ferromagnetic intramolecular exchange interaction. This finding is confirmed and analysed by using wavefunction‐based methods which indicate that the exchange interaction is governed by the substituent of the radical rather than by its heteroatom.