Dysprosium(iii) compounds assembled via a versatile ligand incorporating salicylic hydrazide and 8-hydroxyquinolin units: syntheses, structures and magnetic properties

Abstract

Assembly of dysprosium(III) salts with a new multidentate ligand H3L ((2-hydroxy)-N'-((8-hydroxyquinolin-2-yl)methylene)-benzohydrazide) affords a variety of products with different topological structures, namely [Dy(H2L)(HL)]·CH3OH (1), [Dy2(HL)2(C6H5COO)2(CH3OH)2]·3CH3OH (2), [Dy2(HL)2(NO3)2(DMF)4]·4DMF (3), [Dy4L4(CH3OH)4]·2CH3OH·4H2O (4) and...

Air-stable chiral mono- and dinuclear dysprosium single-molecule magnets: steric hindrance of hexaazamacrocycles

“…47 In contrast, for 2R and 2S, χ M T products decline gradually and then increase rapidly to maxima of 41.26 and 40.53 cm 3 K mol −1 at 2 K, suggesting the existence of intramolecular ferromagnetic interactions. 48,49 As shown in Fig. 4, S9 and S15, † magnetisation (M) versus field (H) curves rise rapidly at low fields, followed by a slow increase at high fields, reaching a maximum of 5.49μ B for 1R, 5.60μ B for 1S, 11.59μ B for 2R and 10.82μ B for 2S, respectively, at 7 T and 1.9 K. The lack of saturation of M values at different measuring temperatures indicates the presence of significant magnetic anisotropy in all complexes.…”

Synthesis, structures and magnetic properties of four dysprosium-based complexes with a multidentate ligand with steric constraint

“…The application of proper ligands is not only beneficial for tuning the geometry and coordination environment of the complex to maintain its large anisotropy, but also for coordinating the magnetic interactions between metal ions. [34][35][36][37][38][39] Therefore, synthetic chemists are increasingly working to control the fine structure of SMMs by the artful selection of ligands so as to obtain a deeper understanding of the relationship between the coordination structure and magnetization dynamics. To date, many potential ligands have been developed.…”