Abstract
The reaction of DyCl3 with hydrazone Schiff base ligands and sodium acetate in the presence of triethylamine (Et3N) as base affords two dysprosium dimers: [Dy2(HL1)2(OAc)2(EtOH)(MeOH)] (1) and [Dy2(L2)2(OAc)2(H2O)2]·2MeOH (2). The DyIII ions in complexes 1 and 2 are linked by alkoxo bridges, and display “hula hoop” coordination geometries. Consequently, these two compounds show distinct magnetic properties. Complex 1 behaves as a field-induced single molecule magnet (SMM), while typical SMM behavior was observed for complex 2. In addition, comparison of the structural parameters among similar Dy2 SMMs with hula hoop-like geometry reveals the significant role played by coordination geometry and magnetic interaction in modulating the relaxation dynamics of SMMs.
Highlights
IntroductionConsiderable attention has been paid to the design of new single molecule magnets (SMMs) involving 4f metal ions because of their significant magnetic anisotropy arising from the large unquenched orbital angular momentum [1,2]
Comparison of the structural parameters among similar Dy2 single molecule magnet (SMM) with hula hoop-like geometry reveals the significant role played by coordination geometry and magnetic interaction in modulating the relaxation dynamics of SMMs
Considerable attention has been paid to the design of new single molecule magnets (SMMs) involving 4f metal ions because of their significant magnetic anisotropy arising from the large unquenched orbital angular momentum [1,2]
Summary
Considerable attention has been paid to the design of new single molecule magnets (SMMs) involving 4f metal ions because of their significant magnetic anisotropy arising from the large unquenched orbital angular momentum [1,2]. We can better understand the structure–property relationship to design DyIII -based compounds with specific magnetic properties. 2 complexes with hydrazone-containing Schiff base ions [1]. 2 complexes with hydrazone-containing Schiff ligands have been reported to date. With this in mind, we designed two novel ligands, namely base ligands have been reported to date. 3-hydroxy-naphthalene-2-carboxylic acid (6-hydroxymethyl-pyridin-2-ylmethylene)-hydrazide and nicotinic acid (6-hydroxymethyl-pyridin-2-ylmethylene)-hydrazide (H2 L2), which are obtained (H3L1) and nicotinic acid (6-hydroxymethyl-pyridin-2-ylmethylene)-hydrazide (H2L2), which are by in situ reaction of 6-hydroxymethyl-pyridine-2-carbaldehyde with the corresponding hydrazine obtained by in situ reaction of 6-hydroxymethyl-pyridine-2-carbaldehyde with the corresponding (Scheme 1) These ligands provide O, N, N, O-based chelating sites forming coordination pockets which hydrazine (Scheme 1).
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