1. Optimization of Magnetic Relaxation and Isotopic Enrichment in Dimeric DyIII Single‐Molecule Magnets.
- Author
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Huang, Gang, Yi, Xiaohui, Jung, Julie, Guillou, Olivier, Cador, Olivier, Pointillart, Fabrice, Le Guennic, Boris, and Bernot, Kevin
- Subjects
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SINGLE molecule magnets , *MAGNETIC relaxation , *ISOTOPIC abundance , *DYSPROSIUM , *DIMERIC ions , *ANTIFERROMAGNETIC materials - Abstract
Single‐molecule magnet (SMM) behavior of dysprosium‐based dimers was optimized by substitution of a DyIII ancillary ligand (hfac– in the previously reported
DyPyNO and tta– inDy ). A clear hysteresis opening is visible at 0.5 K forDy that allows for the determination of an antiferromagnetic (AF) coupling of –2.92 cm–1 (S = 1/2,g z = 19.58) which was confirmed by ab initio calculations. Comparison with the results ofDyPyNO shows that stronger AF coupling correlates with better SMM behavior. This is further demonstrated by diamagnetic substitution, and a Y–Dy species (YDy ) highlights that the strong AF magnetic interaction inDy significantly enhances magnetic relaxation at low temperature. This coupling is also expected to be at the origin of the unexpectedly weak isotopic effect observed for the isotopically pure parents ofDy , namely161Dy and164Dy . [ABSTRACT FROM AUTHOR]- Published
- 2018
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