Exploring the Role of Intramolecular Interactions in the Suppression of Quantum Tunneling of the Magnetization in a 3d-4f Single-Molecule Magnet

Abstract

Hydroxide-bridged Fe III 4 Ln III 2 clusters having the general formula [Fe 4 Ln 2 (μ 3 -OH) 2 (mdea) 6 (SCN) 2 (NO 3 ) 2 (H 2 O) 2 ]•4H 2 O• 2MeCN {Ln = Y (1), Dy ( 2), mdea = N-methyldiethanolamine} were synthesized and magnetically characterized. The thermal relaxation of the magnetization for 2 and the diluted Fe III 4 Dy III Y III complex 3 (with and without applied field) has been analyzed. The diluted sample shows a dominant QTM at low temperatures that can be removed with a 0.15 T dc field. Both 2 and 3 show moderately high U eff barriers and exhibit hysteresis loops until 5 K.

Interplay between anisotropy and magnetic exchange to modulate the magnetic relaxation behaviours of phenoxo bridged Dy2dimers with axial β-diketonate co-ligands

“…In accordance with the current literature review, it emerges that multidentate Schiff base ligands with distinct coordination environments have been effectively applied in the assembly of polynuclear heterometallic 3d/4f 61–75 and homometallic 4f complexes. 57,76–85 Utilizing the above-mentioned knowledge, we have applied ( E )-2-((pyridin-2-ylmethylene)amino)phenol (LH) in order to construct homometallic lanthanide complexes.…”

Significantly Enhancing the Single-Molecule-Magnet Performance of a Dinuclear Dy(III) Complex by Utilizing an Asymmetric Auxiliary Organic Ligand

“…Direct current (dc) susceptibility measurements of 1 and 2 were performed under a 1000 Oe dc field in the range of 1.8–300 K. As shown in Figure a, the χ M T value at room temperature is 28.04 cm 3 K mol –1 , which is slightly lower than the expected value of 28.34 cm 3 K mol –1 for two uncoupled Dy III ions ( 6 H 15/2 , g = 4/3) . On other hand, the magnetic-site dilution strategy is one of the most effective methods to deeply understand the origin of the magnetic relaxation of SMMs and the method has been widely employed, ,,,,, because paramagnetic ions such as Dy III can be diluted in an isomorphous diamagnetic matrix, in which the coordination geometries of paramagnetic ions would be unchanged in comparison to the undiluted complexes and the dipolar couplings can be effectively suppressed. For 2 , its χ M T value at room temperature is 2.79 cm 3 K mol –1 (Figure b).…”

A new hexanuclear Fe(iii) nanocluster: synthesis, structure, magnetic properties, and efficient activity as a precatalyst in water oxidation

“…7,8 SMMs are those molecules that show a superparamagnetic behavior in the absence of an external magnetic field. 9,10…”

“…7,8 SMMs are those molecules that show a superparamagnetic behavior in the absence of an external magnetic field. 9,10 Obtaining and storing renewable energy through water splitting is one of the critical research topics these days. [11][12][13][14][15] The oxidation of water to generate H + ions and molecular oxygen is a complicated reaction.…”