Exchange Coupling and Its Chemical Trend Studied by High-Frequency EPR on Heterometallic [Ln2Ni] Complexes

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• 作者：Atsushi Okazawa ; Takashi Shimada ; Norimichi Kojima ; Shunsuke Yoshii ; Hiroyuki Nojiri ; Takayuki Ishida
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 2, 2013
• 年：2013
• 卷：52
• 期：23
• 页码：13351-13355
• 全文大小：376K
• 年卷期：v.52,no.23(December 2, 2013)
• ISSN：1520-510X

文摘

We applied high-frequency electron paramagnetic resonance to trinuclear 4f鈥?d 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 parameter J_Ln鈥揘i as well as nickel(II) zero-field splitting parameters. In contrast to the antiferromagnetic Dy analogue, ferromagnetic couplings were precisely characterized as J_Gd鈥揘i/k_B = +0.301(4) K, J_Tb鈥揘i/k_B = +0.216(12) K, and J_Ho鈥揘i/k_B = +0.110(3) K (defined as 鈭?i>J_Ln鈥揘i鈭?i>J_Ln^zS_Ni).