Three new heterometallic ZnII–LnIII complexes with a windmill-like framework and field-induced SMM behavior

Abstract

We have prepared three 3d–4f heterometallic complexes, namely[Ln₃Zn₃(Hvanox)₃(vanox)₃(NO₃)₆(H₂O)₅]·nEtOH (Ln^III = Dy, n = 3 (1), Ln^III = Tb, n = 5 (2), Ln^III = Er, n = 5 (3)), by the reaction of o-vanillin oxime (H₂L) with Zn(NO₃)₂·6H₂O and Ln(NO₃)₂·6H₂O salts in the presence of triethylamine. Single Crystal X-ray diffraction shows Zn ions and Ln ions are linked together to display a windmill-like framework with the dinuclear LnZn(HL)(L) as flabellum. Magnetic measurements reveal that complexes 1 and 2 exhibit field-induced frequency-dependence signals, indicating single-molecule magnetism (SMM) behaviors, while complex 3 exhibits slow magnetic relaxation.