4 years ago

Optimization of magnetic relaxation and isotopic enrichment in dimeric DyIII single-molecule magnets

Boris Le Guennic, Olivier Cador, Fabrice Pointillart, Julie Jung, Olivier Guillou, Kevin Bernot, Gang Huang, Xiaohui Yi
Single-molecule magnet (SMM) behavior on Dy-based dimers has been optimized by substitution of DyIII ancillary ligand (hfac- in previously reported DyPyNO, for tta- in Dy). Clear hysteresis opening is visible at 0.5K on Dy that allows for the determination of an antiferromagnetic coupling of -2.92 cm.-1 (S=1/2, gz=19.58) that is confirmed by ab-initio calculations. Comparison with DyPyNO shows that the strongest the AF coupling is, the better is the SMM behavior. This is further demonstrated by diamagnetic substitution and Y-Dy species (YDy) highlights that the strong AF magnetic interaction in Dy severely enhance magnetic relaxation at low T. This coupling is also expected to be at the origin of the unexpectedly weak isotopic effect observed on isotopically-pure parent of Dy, namely 161Dy and 164Dy.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700842

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