Synthesis and Magnetism of Neutral, Linear Metallocene Complexes of Terbium(II) and Dysprosium(II)
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https://figshare.com/articles/dataset/Synthesis_and_Magnetism_of_Neutral_Linear_Metallocene_Complexes_of_Terbium_II_and_Dysprosium_II_/9553322
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资源简介：
The
divalent metallocene complexes Ln(CpiPr5)2 (Ln
= Tb, Dy) were synthesized through the KC8 reduction
of Ln(CpiPr5)2I intermediates and represent
the first examples of neutral, linear metallocenes for these elements.
X-ray diffraction analysis, density functional theory calculations,
and magnetic susceptibility measurements indicate a 4fn5d1 electron configuration with strong
s/d mixing that supports the linear coordination geometry. A comparison
of the magnetic relaxation behavior of the two divalent metallocenes
relative to salts of their trivalent counterparts, [Ln(CpiPr5)2][B(C6F5)4], reveals
that lanthanide reduction has opposing effects for dysprosium and
terbium, with magnetic relaxation times increasing from TbIII to TbII and decreasing from DyIII to DyII. The impact of this effect is most notably evident for Tb(CpiPr5)2, which displays an effective thermal barrier
to magnetic relaxation of 1205 cm–1 and a 100-s
blocking temperature of 52 K, the highest values yet observed for
any nondysprosium single-molecule magnet.
创建时间：
2019-08-02
