Heterometallic Compounds Involving d- and f-Block Elements: Synthesis, Structure, and Magnetic Properties of Two New LnxCu4 Complexes

An La4 plane, which separates two pairs of Cu atoms, characterizes the La4Cu4 complex 1, whose structure is shown on the right. The Gd2Cu4 complex 2, synthesized similarly to 1, shows ferromagnetic coupling between the Cu and the Gd atoms. Both complexes are of interest as model compounds for high‐temperature superconductors (L = 2‐hydroxypyridine anion).