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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The differential magnetic relaxation behaviours of slightly distorted triangular dodecahedral dysprosium analogues in a type of cyano-bridged 3d-4f zig-zag chain compounds
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The differential magnetic relaxation behaviours of slightly distorted triangular dodecahedral dysprosium analogues in a type of cyano-bridged 3d-4f zig-zag chain compounds

机译：略带扭曲的三角形十二型镝类似物中略带扭曲的磁性松弛行为在一种氰基桥接3D-4F Zig-Zag链化合物中

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摘要

A class of cyano-bridged 3d-4f zig-zag chain compounds, {RE[TM(CN)(6)] (PNO)(2)(H2O)(4)}(H2O) {RE = Y-III, TM = [Fe-III](LS) (1); RE = Dy-III, TM = [Fe-III](LS) (2), Co-III (3)}, have been synthesized and characterized by single-crystal X-ray diffraction. The rare earth ions in these compounds are situated in a slightly distorted triangular dodecahedral (D-2d) coordination environment. The magnetic properties of compounds 1-3 have been comparatively studied in detail. Under a zero dc field, the temperature dependence of ac susceptibility measurements for YFe (1) indicates the absence of magnetic relaxation stemming from the single anisotropic [Fe-III](LS) ion. The dysprosium analogue DyFe (2) shows only magnetic relaxation behavior with a prominent QTM effect, while DyCo (3) exhibits SIM properties not completely covered by QTM, with an extracted energy barrier of 73 K under a zero dc field. The ab initio calculations indicate that both compounds 2 and 3 are SMMs with well-behaved magnetic relaxation properties primarily from the individual Dy-III ion. Therefore, the different magnetic behaviors exhibited by compound 2 compared to 3 may be ascribed to the stronger QTM effect caused by the extra weak interaction of [Fe-III](LS) ions in 2 as a fluctuating transverse field around the Dy-III ion. The QTM effect for both 2 and 3 is suppressed under an applied dc field with an effective energy barrier of 134 and 150 K, respectively. Compared with compound 2, the higher extracted U-eff/k(B) and chi ''(T) peak temperature for 3 should be further attributed to its slightly higher single-ion axiality as calculated and the elimination of the transverse field from the [Fe-III](LS) ion.
机译：一类氰基桥接3D-4F Zig-Zag链化合物，{Re [TM（CN）（6）]（PNO）（2）（2）（H2O）（4）}（H2O）}（Re = Y-III，TM = [Fe-III]（LS）（1）; RE = DY-III，TM = [FE-III]（LS）（2），CO-III（3）}已被合成并通过单晶X射线衍射表征。这些化合物中的稀土离子位于略微扭曲的三角形十二型（D-2D）配位环境中。化合物1-3的磁性已经详细研究。在零DC场下，YFE（1）的AC敏感度测量的温度依赖性表明，没有从单个各向异性[Fe-III]（LS）离子源的磁性弛豫。镝型染料（2）仅显示磁性QTM效应的磁性松弛行为，而DYCO（3）则表现出QTM未完全覆盖的SIM属性，在零DC场下提取的73 k的能量屏障。 AB初始计算表明，化合物2和3是具有良好表现良好的磁性弛豫特性的SMM，主要来自单独的Dy-III离子。因此，化合物2与3相比表现出的不同磁性行为可以归因于通过[Fe-III]（LS）离子在Dy-III离子周围的波动横向场中的额外弱QTM效应引起的较强的QTM效应。在具有134和150k的有效能量屏障的施加的DC场下抑制了2和3的QTM效应。与化合物2相比，较高提取的U-EFF / K（B）和CHI'（T）峰值温度应进一步归因于其略高的单离子轴向，如计算）和从中消除横向场[Fe-III]（LS）离子。

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