Magnetic properties and exchange couplings of one-dimensionally arrayed 4f-3d heterometallic [Ln2Cu2]n compounds

被引：18
作者：
Okazawa, Atsushi [1 ]
Watanabe, Ryo [1 ]
Nojiri, Hiroyuki [2 ]
Nogami, Takashi [1 ]
Ishida, Takayuki [1 ]
机构：
[1] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
POLYHEDRON | 2009年 / 28卷 / 9-10期
关键词：
EPR; Single-molecule magnet; Lanthanide; Rare earth metal; Exchange interaction; SINGLE-MOLECULE MAGNET; II/GD-III COUPLE; INTRINSIC PROPERTY; COMPLEXES; TETRANUCLEAR; LANTHANIDE; CHAIN; FERROMAGNETISM; LN;
D O I：
10.1016/j.poly.2008.12.035
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Heterometallic polymeric coordination compounds [{Ln(hfac)(2)(CH3OH)}(2){Cu(dmg)(Hdmg)}(2)](n) ([Ln(2)Cu(2)](n); Ln = Tb, Ho, and Er; H(2)dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous to those of the known ferrimagnetic [Gd2Cu2](n) and [Dy2Cu2](n) analogs. The exchange couplings in [Tb2Cu2](n), [Ho2Cu2](n), and [Er2Cu2](n) were precisely evaluated by high-frequency EPR and pulsed-field magnetization studies, giving J(Tb-Cu)/k(B) = -0.77(2)K, J(Ho-Cu)/k(B) = -0.250(12)K and J(Er-Cu)/k(B) = -0.149(15) K. They were comparable to those of the Gd and Dy analogs. The absolute value of the exchange coupling parameter monotonically decreases in the order of Gd, Tb, Dy, Ho, and Er. (C) 2008 Elsevier Ltd. All rights reserved.
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收藏
页码：1808 / 1813
页数：6
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