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Slow Magnetic Relaxation in a Redox‐Active Tetrathiafulvalene‐Based Ferromagnetic Dysprosium Complex
Author(s) -
Pointillart Fabrice,
Golhen Stéphane,
Cador Olivier,
Ouahab Lahcène
Publication year - 2014
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.201402181
Subject(s) - tetrathiafulvalene , dysprosium , magnetic relaxation , ferromagnetism , magnetic susceptibility , chemistry , relaxation (psychology) , ion , oxide , single molecule magnet , condensed matter physics , crystallography , magnetic field , molecule , materials science , inorganic chemistry , magnetization , physics , social psychology , psychology , organic chemistry , quantum mechanics
The association of the two 4,5‐bis(thiomethyl)‐4′‐carboxytetrathiafulvalene (H L 1 ) and 4,5‐bis(thiomethyl)‐4′‐(2‐pyridyl‐ N ‐oxide)carbamoyltetrathiafulvalene ( L 2 ) with the metalloprecursor [Dy(tta) 3 ] · 2H 2 O (tta = 2‐thenoyltrifluoroacetonate) leads to the formation of the dinuclear complex of formula [Dy(tta) 2 ( L 1 )( L 2 )] 2 · 2CH 2 Cl 2 . Static magnetic measurements highlight significant ferromagnetic interactions between the Dy III ions, and dynamic magnetic measurements demonstrate single‐molecule‐magnet behaviour with an energy barrier of 20 cm –1 and a relaxation time of 8.6(9) × 10 –6 s. The thermal dependence of the magnetic susceptibility was evaluated by using a crystal field approach (Stevens operators), which confirmed the Ising character of the system. Finally, electrochemistry shows a complex multiredox system with the successive oxidations of the two tetrathiafulvalene (TTF) ligands.