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Optimization of Magnetic Relaxation and Isotopic Enrichment in Dimeric Dy III Single‐Molecule Magnets
Author(s) -
Huang Gang,
Yi Xiaohui,
Jung Julie,
Guillou Olivier,
Cador Olivier,
Pointillart Fabrice,
Le Guennic Boris,
Bernot Kevin
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700842
Subject(s) - dysprosium , chemistry , diamagnetism , single molecule magnet , crystallography , relaxation (psychology) , inductive coupling , antiferromagnetism , ab initio quantum chemistry methods , magnet , molecule , ab initio , lanthanide , coupling (piping) , magnetic relaxation , magnetization , inorganic chemistry , condensed matter physics , ion , magnetic field , materials science , social psychology , psychology , physics , organic chemistry , quantum mechanics , electrical engineering , metallurgy , engineering
Single‐molecule magnet (SMM) behavior of dysprosium‐based dimers was optimized by substitution of a Dy III ancillary ligand (hfac – in the previously reported DyPyNO and tta – in Dy ). A clear hysteresis opening is visible at 0.5 K for Dy 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 of DyPyNO 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 in Dy 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 of Dy , namely 161Dy and 164Dy .