Magnetic Memory Effect in a Transuranic Mononuclear Complex

Abstract

Selective memory: Using actinides in designing molecular nanomagnets could provide better performance and higher anisotropy barriers, owing to the peculiar properties of the 5f electron shell. Neptunocene is found to display an open magnetic hysteresis cycle at low temperatures (see picture), and interaction with the hyperfine degrees of freedom determines whether the magnetic relaxation is fast or slow at a given field value.

Radical ligand-containing single-molecule magnets

“…However, only a few actinide complexes have been shown to exhibit slow magnetic relaxation, with nearly all of these being uranium complexes [343][344][345][346][347][348][349][350][351]. Nevertheless, despite the difficulties associated with handling of the more radioactive transuranic elements, neptunium and plutonium-based singlemolecule magnets have also been reported [352][353][354].…”

A base-free synthetic route to anti-bimetallic lanthanide pentalene complexes

“…Multimetallic complexes of the lanthanide metals are of interest as molecular models for lanthanide-based polymers, 1,2 which have potential applications in magnetic materials, [3][4][5][6] molecular catalysis, 7,8 and luminescent devices. [9][10][11] The aromatic ligand pentalene [C 8 H 6 ] 2− (= Pn) has shown the ability to facilitate strong electronic delocalisation in anti-bimetallic transition metal compounds, 12 and promote coupling effects through the planar π-system of the bridging Pn ligand.…”

Modulating the magnetic relaxation of lanthanide-based single-molecule magnets

“…In addition, the use of actinides in molecular magnetism appears timely. Recently, slow magnetic relaxation behavior has been observed with actinide-based complexes, U(H 2 BPz 2 ) 3 [51], [Ac(COT) 2 ] − (Ac = Np; COT 2− = C 8 H 8 2− ) [52], which is a good sign that the 5f elements might be promising for the design of SMMs with enhanced barriers.…”