Structure and Single‐Molecule Magnetic Property of a Dinuclear Dy₂ Complex Bridged by the 4‐Methylpyridine N‐Oxide Ligand

Abstract

A dinuclear dysprosium complex, [Dy 2 (tta) 6 (4-mepyNO) 2 ]·CHCl 3 (tta = thenoyltrifluoroacetone, 4-mepyNO = 4-methylpyridine N-oxide), has been structurally and magnetically characterized. Analysis of the single-crystal structure revealed that the NO group serves as an effective bridge to link the two Dy III centres and combine with the peripheral -diketonate ligands to form an eight-coordinate geometry of Dy III . Magnetic measurements showed significant zero-field single- [a]

Two Dy(III) Single-Molecule Magnets with Their Performance Tuned by Schiff Base Ligands

“…The two magnetic axes of complex 1 on its two Dy­(III) ions, which are parallel to each other, are nearly located in the Dy 2 (μ 2 -O) 2 plane, with an angle of 16.83° between the magnetic axis and the line passing through the two Dy­(IIII) ions. This is rare and much different from the reported similar structures in which the magnetic axes are nearly perpendicular to the Dy 2 (μ 2 -O) 2 plane. ,, The angles between the magnetic axes on each pair of Dy1···Dy2, Dy2···Dy2A, Dy3···Dy2A, Dy1···Dy3, and Dy2···Dy3 in 2 are 160.8, 180, 122.7, 106.0, and 57.3° for complex 2 , respectively. Obviously, the different performances of complexes 1 and 2 are a consequence of the synergistic effect of the magnetic difference of individual Dy­(III) ions and different intermetallic magnetic interactions induced by the different topological arrangements of Dy­(III) ions in the two titled complexes.…”

“…This is rare 79 and much different from the reported similar structures in which the magnetic axes are nearly perpendicular to the Dy 2 (μ 2 -O) 2 plane. 36,58,59 The angles between the magnetic axes on each pair of Dy1 Table 2. Simulated Constants for Magnetic Exchange (J exch ), Dipole−Dipole Interaction (J dip ), and Also the Total Coupling (J) for the Two Titled Complexes (cm −1 ) with Their Intermolecular Interactions (zJ′) Simulated at −0.01 and −0.03 cm −1 for 1 and 2, Respectively…”

“…This is rarely seen in the reported SMMs with similar skeletons, 48 which usually present antiferromagnetic interactions. 36,[48][49][50][51]58,59 The completely different χ M T versus T profile of 2 from that of 1 seems to suggest a dominant antiferromagnetic interaction in 2, although it is also possible for a ferromagnetic interaction to exist in 2. These hypotheses are supported by the related simulation.…”

Organic magnetoelectric and optomagnetic couplings: perspectives for organic spin optoelectronics

“…The relative change in the magnitude of the dielectric permittivity of this SMM was~0.75% under 80 kOe, and a larger dielectric permittivity may be obtained by further increasing the applied magnetic field. The magnetodielectric coupling effect of this MM was comparable to that of some inorganic multiferroic compounds 51 . Overall, room-temperature MMs provide a good platform for the development of magnetoelectric coupling.…”