Tremendous interest in single molecule magnets centers largely around their potential applications in molecular spintronic and quantum information storage. In order to realize these potential, large spin relaxation barriers and high blocking temperatures and must be achieved. With low-coordinate transition metal complexes the effective relaxation barriers reach as high as 226 cm-1.1 By employing lanthanide ions such as Tb3+, Dy3+, and Er3+ which possess intrinsically large orbital angular momentum, significantly higher barriers can be achieved. Large anisotropic barriers, however, do not always lead to high blocking temperatures if the exchange coupling is not strong enough to suppress quantum tunneling of the magnetization. Hence bridging two lanthanide ions through an organic radical to enhance exchange coupling has proven to be the most promising method. A number of record single molecule magnets have been produced through this strategy.2 Herein, the remarkable magnetic properties of several lanthanide complexes involving radical bridging ligands such as [2,3,5,6-tetra(2-pyridyl)pyrazine]- and [2,2'-bipyrimidine]- will be presented.

Radical-Bridged lanthanide single-molecule magnets with high blocking temperatures

253rd National Meeting (2017)

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