Slow Magnetic Relaxation Observed in Dysprosium Compounds Containing Unsupported Near-Linear Hydroxo- and Fluoro-Bridges
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https://figshare.com/articles/dataset/Slow_Magnetic_Relaxation_Observed_in_Dysprosium_Compounds_Containing_Unsupported_Near_Linear_Hydroxo_and_Fluoro_Bridges/2152459
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资源简介：
The encapsulating N1,N3-bis(3-methoxysalicylidene)diethylenetriamine
(H2valdien) ligand was employed to isolate two novel DyIII compounds which contain rare bridging pathways for lanthanide
systems. Compound 1, [Na2DyIII2(valdien)2(μ-OH)(dbm)2(H2O)2][Na2DyIII2(valdien)2(μ-OH)(NO3)2(dbm)2], where dbm– is dibenzoylmethanido,
and compound 2, [Na3DyIII2(valdien)2(μ-F)(μ3-F)2(Cl)2(MeOH)2]n·0.5(MeOH)·(H2O), both exhibit linear lone hydroxo-
and fluoro-bridges, respectively, between the metal centers. The unit
cell of 1 comprises two discrete dinuclear molecules,
which differ slightly, forming a cation–anion pair, while 2 forms a coordination polymer. The magnetic investigations
indicate that both compounds display ferromagnetic coupling between
the DyIII ions. Magnetic susceptibility measurements in
the temperature range 1.8–300 K reveal that the DyIII ions in 1 are weakly coupled, resulting in a mononuclear
single-molecule magnet-like behavior under an applied field. In the
case of 2, the stronger coupling arising from the fluoride-bridge,
leads to zero-field single-molecule magnet (SMM) behavior with a non-negligible
anisotropy barrier (Ueff) of 42 K.
创建时间：
2016-02-13
