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.

引用

页码：1808 / 1813

页数：6

共 28 条

[21] Ferromagnetic Dy-Ni and Antiferromagnetic Dy-Cu Couplings in Single-Molecule Magnets [Dy2Ni] and [Dy2Cu] [J].

Okazawa, Atsushi ;

Nogami, Takashi ;

Nojiri, Hiroyuki ;

Ishida, Takayuki .

INORGANIC CHEMISTRY, 2008, 47 (21) :9763-9765

[22] Exchange coupling and energy-level crossing in a magnetic chain [Dy2Cu2]n evaluated by high-frequency electron paramagnetic resonance [J].

Okazawa, Atsushi ;

Nogami, Takashi ;

Nojiri, Hiroyuki ;

Ishida, Takayuki .

CHEMISTRY OF MATERIALS, 2008, 20 (09) :3110-3119

[23] A tetranuclear 3d-4f single molecule magnet:: [CuIILTbIII(hfac)2]2 [J].

Osa, S ;

Kido, T ;

Matsumoto, N ;

Re, N ;

Pochaba, A ;

Mrozinski, J .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (02) :420-421

[24] RARE-EARTH TRISHEXAFLUOROACETYLACETONATES AND RELATED COMPOUNDS [J].

RICHARDSON, MF ;

WAGNER, WF ;

SANDS, DE .

JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1968, 30 (05) :1275-+

[25]

*RIG MSC, 2003, CRYSTALSTRUCTURE VER

[26] The first A2B2-heterometal ferrimagnetic chain.: Structures and magnetic properties of polymeric [Gd2Cu2]n and the corresponding monomer [J].

Ueki, S ;

Kobayashi, Y ;

Ishida, T ;

Nogami, T .

CHEMICAL COMMUNICATIONS, 2005, (41) :5223-5225

[27] Tetranuclear heterometallic cycle Dy2Cu2 and the corresponding polymer showing slow relaxation of magnetization reorientation [J].

Ueki, Sohei ;

Okazawa, Atsushi ;

Ishida, Takayuki ;

Nogami, Takashi ;

Nojiri, Hiroyuki .

POLYHEDRON, 2007, 26 (9-11) :1970-1976

[28] Quantum tunneling of magnetization via well-defined Dy-Cu exchange coupling in a ferrimagnetic high-spin [Dy4Cu] single-molecule magnet [J].

Ueki, Sohei ;

Ishida, Takayuki ;

Nogami, Takashi ;

Choi, Kwang-Yong ;

Nojiri, Hiroyuki .

CHEMICAL PHYSICS LETTERS, 2007, 440 (4-6) :263-267

← 1 2 3 →