The rare earth (RE) metals have been utilized in a number of applications including medicine, sensing, and magnetism. This is exemplified in permanent magnets such as SmCo5 and Nd2Fe14B where the magnetism stems from magnetically anisotropic lanthanides. The high magnetic anisotropy originates from the large unquenched orbital momentum and strong spin orbit coupling induced by the 4f orbitals. In recent years, lanthanides have also been proven useful for the design of single-molecule magnets (SMMs). SMMs are molecular systems that retain their magnetic alignment in the absence of a magnetic field. These types of molecules have potential applications in high density data storage and quantum computing. In bimetallic SMMs, there are two paramagnetic nuclei conjoined by a bridging ligand. For a diamagnetic bridging ligand, magnetic exchange coupling tends to be weak owing to the limited radical extension of the 4f orbitals. However, magnetic exchange coupling can be substantially increased by bridging the two metal centers with a radical ligand. Here, we will report the synthesis, structure, magnetism, and reactivity of a series of bimetallic RE metal complexes, where the metal centers are bridged by diamagnetic and paramagnetic ligands, respectively.

Reactivity of dinuclear lanthanide single-molecule magnets

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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