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首页> 外文期刊>Chemistry: A European journal >Analytical determinationof the {Ln-Aminoxyl radical} exchange interaction taking into account both the ligand-field effect and the spin-orbit coupling of the lanthanide ion (Ln = Dy~(III) and Ho~(III))
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Analytical determinationof the {Ln-Aminoxyl radical} exchange interaction taking into account both the ligand-field effect and the spin-orbit coupling of the lanthanide ion (Ln = Dy~(III) and Ho~(III))

机译：结合镧系离子（Ln = Dy〜（III）和Ho〜（III））的配体场效应和自旋轨道耦合，对{Ln-氨氧基自由基}交换相互作用的分析确定

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摘要

Numerous compounds in which a paramanetic Ln~(III) ion is in an exchange interaction with a second spin carrier, such as a transition metal ion or an organic radical, have been described. However, except for Gd~(III), very little has been reported about the magnitude of the interactions. Indeed, for these ions both the ligand-field effects and the exchange interactions between the magnetic centers become relevant in the same temperature range; this makes he analysis of the magnetic behavior of such compounds more difficult. In this study, quantitative analyses of the thermal variations of the static isothermal initial magnetic susceptibility measured on powdered samples of the {Ln(NO_3)_3[organic radical]_2} (Ln = Dy~(III) and Ho~(III)) compoounds were performed. The ligand-field effects on the Ln ions were taken into account, and the exchange interactions within a molecule were treated exactly within an appropriate Racah formalism. Values of the intramolecular {Ln - aminoxyl radical} exchange parameter have thus been rigorously deduced for both the Dy Karmers and Ho non-Kramers ion-based compounds. Ferromagnetic {Ln - radical} interfactions are found for both the Dy and Ho derivatives with J = 8 cm~(-1) and J = 4.5 cm~(-1), respectively.
机译：已经描述了许多化合物，其中寄生的Ln-（III）离子与第二种自旋载体发生交换相互作用，例如过渡金属离子或有机基团。但是，除了Gd〜（III）以外，几乎没有关于相互作用强度的报道。实际上，对于这些离子，在相同温度范围内，配体场效应和磁性中心之间的交换相互作用都变得重要。这使得分析这类化合物的磁行为更加困难。在这项研究中，对{Ln（NO_3）_3 [有机基] _2}（Ln = Dy〜（III）和Ho〜（III））粉末样品上测得的静态等温初始磁化率的热变化进行定量分析。进行了复合。考虑了对Ln离子的配体场效应，并在适当的Racah形式主义中精确地处理了分子内的交换相互作用。因此，对于Dy Karmers和Ho基于非Kramers离子的化合物，都严格推定了分子内{Ln-氨氧基自由基}交换参数的值。发现Dy和Ho衍生物的铁磁{Ln-自由基}相互作用分别为J = 8 cm〜（-1）和J = 4.5 cm〜（-1）。

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