A new D2d-symmetry DyIII mononuclear single-molecule magnet containing a monodentate N-heterocyclic donor ligand†
Abstract
Three new lanthanide complexes [Ln(hfac)3(pz)2] (Ln = Dy (1), Tb (2), Ho (3); hfac = hexafluoroacetylacetonate; pz = pyrazole) based on pyrazole have been prepared and characterized structurally. X-ray crystallographic analysis reveals that all three complexes are isomorphous. The crystal structures of these complexes consist of a mononuclear molecule unit in which the center LnIII ion is surrounded with a slightly distorted D2d-dodecahedron LnO6N2 coordination sphere from three hfac anions and two pyrazole ligands. Both static and dynamic magnetic properties were studied for complex 1, which is proved to be a rarely reported D2d-symmetry DyIII mononuclear single-molecule magnet containing a monodentate N-heterocyclic donor ligand, and the luminescence characterization of complexes 1–3 in both visible and NIR regions is also studied.