Anisotropic exchange interactions in [LnFe] dinuclear systems: Magnetometry, dual mode X-band Electron Paramagnetic Resonance, and Mössbauer spectroscopic studies

It was possible to define some trends concerning the exchange components of the [CeFe] dimer according to which the isotropic exchange constant is smaller than 2 cm−1 and the anisotropic components are [D, E] = [0.06(1), 0.05(1)] cm−1. Using EPR spectrosopy it was possible to prove that the [PrFe] and [EuFe] dimers have negligible interactions. For the case of [PrFe], using appropriate magnetic models the energy difference between the ground state Γ1 and the excited Γ3, Γ4 and Γ5 were calculated and found to be Δ31 = 293(5) cm−1, Δ41 = 76(5) cm−1 and Δ51 = 232(5) cm−1. For the case of [EuFe], the spin-orbit coupling parameter was found to be λ = 340 cm−1.