Multifunctional ZnII–LnIII (Ln = Tb, Dy) complexes based on the amine-phenol ligand with field-induced slow magnetic relaxation, luminescence, and proton conduction

Abstract

Two new Zn^II–Ln^III heterometallic complexes derived from the amine-phenol ligand, namely [Zn₂Ln(L)₂(H₂O)₂](ClO₄)₃·3.5H₂O (Ln = Dy (1) and Tb (2), H₂L = 1,2-bis(3-methoxysalicylideneethylaminooxy)ethane), have been synthesized and structurally characterized. Complexes 1 and 2 are isomorphic trinuclear clusters and crystallize in the triclinic P space group. Magnetic measurements indicate that complex 1 exhibits field-induced slow magnetic relaxation with energy barrier of 27.91 K. Both display strong fluorescence emissions, which are typical narrow emission bands of lanthanide ions. Moreover, complex 2 shows a proton conductivity of 6.43 × 10⁻⁵ S cm⁻¹ at 60 °C and 98% relative humidity. Complexes 1 and 2 as multifunctional materials may offer a potential application in magnetic, luminescent, and electrical devices.