Heteroleptic Lanthanide Complexes Coordinated by Tripodal Tetradentate Ligand: Synthesis, Structure, and Magnetic and Photoluminescent Properties

We report the synthesis, structures, and magnetic and luminescent properties of a series of heteroleptic lanthanide complexes based on a tripodal tetradentate ligand: [Ln­(Tpma)­(NO3)3]·nMeCN (Ln = Eu (1), Tb (2), Dy (3), Er (4), n = 0.5; Yb (5), n = 0; Tpma = tris­((1H-pyrazol-1-yl)­methyl)­amine). The europium, terbium, and dysprosium analogues exhibit a lanthanide-based luminescence, while the dysprosium, erbium, and ytterbium compounds show a field-induced slow relaxation of their magnetization involving Raman and direct processes.