Axial elongation of mononuclear lanthanide metallocenophanes. Magnetic properties of dysprosium- and terbium-[1]ruthenocenophane complexes

We report the first f-block-ruthenocenophane complexes 1 (Dy) and 2 (Tb) and provide a comparative discussion of their magnetic structure with respect to earlier reported ferrocenophane analogues. While axial elongation of the rare trigonal-prismatic geometry stabilizes the magnetic ground state in the case of Dy${}^{3+}$ and results in a larger barrier to magnetization reversal (U), a decrease in U is observed for the case of Tb${}^{3+}$. (© 2020 Wiley‐VCH Verlag GmbH and Co. KGaA, Weinheim)