Exchange Couplings and Its Chemical Trend Studied by High-Frequency EPR on Heterometallic [Ln_2Ni] Complexes
Exchange Couplings and Its Chemical Trend Studied by High-Frequency EPR on Heterometallic [Ln_2Ni] Complexes
复制标题
异金属[Ln_2Ni]配合物的高频EPR研究交换耦合及其化学趋势
DOI：
10.1021/ic402417h
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发表时间：
2013
期刊：
影响因子：
4.6
通讯作者：
and T. Ishida
中科院分区：
文献类型：
--
作者：
A. Okazawa;T. Shimada;N. Kojima;S. Yoshii;H. Nojiri;and T. Ishida
采用高频电子顺磁共振技术对三核4f-3d杂金属配合物[{Ln(hfac)3}2{Ni(dpk)2(py)2}] （Ln = Y, Gd, Tb, Ho; hfac =六氟乙酰丙酮酸酯，dpk =二-2-吡啶酮肟酸酯，py =吡啶）进行了研究，确定了交换参数jln - nias和镍（II）零场分裂参数。与反铁磁Dy类似物相比，铁磁耦合精确表征为jgd - ni /kB= +0.301(4) K, JTb-Ni /kB= +0.216(12) K, jho - ni /kB= +0.110(3) K（定义为−JLn-Ni∑JLnzSNi）。
We applied high-frequency electron paramagnetic resonance to trinuclear 4f–3d heterometallic complexes, [{Ln(hfac)3}2{Ni(dpk)2(py)2}] (Ln = Y, Gd, Tb, and Ho; hfac = hexafluoroacetylacetonate, dpk = di-2-pyridyl ketoximate, and py = pyridine), and determined the exchange parameterJLn–Nias well as nickel(II) zero-field splitting parameters. In contrast to the antiferromagnetic Dy analogue, ferromagnetic couplings were precisely characterized asJGd–Ni/kB= +0.301(4) K,JTb–Ni/kB= +0.216(12) K, andJHo–Ni/kB= +0.110(3) K (defined as −JLn–Ni∑JLnzSNi).