. Magnetism in crown-ether-substituted nitronyl nitroxide derivatives and their metal complexes

被引：0

作者：

Sugano, Tadashi ^{[1
]}

Blundell, Stephen J. ^{[2
]}

Hayes, William ^{[2
]}

Tajima, Hiroyuki ^{[3
]}

Mori, Hatsumi ^{[3
]}

机构：

[1] Meiji Gakuin Univ, Dept Chem, Yokohama, Kanagawa 2448539, Japan

[2] Univ Oxford, Clarendon Lab, Dept Phys, Parks Rd, Oxford OX1 3PU, England

[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 5 | 2012年 / 9卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

magnetism; crown ether; organic radical; rare earths; metal complex; RADICALS;

D O I：

10.1002/pssc.201100647

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Rare-earth-metal (M = Nd, Gd and Dy) complexes of the organic monoradicals, 15-crown-5-phenyl nitronyl nitroxide 1 and 15-crown-5- or 18-crown-6-phenyl iminonitroxide 2, were synthesized. We present here magnetic properties of the metal-free radicals and the metal complexes of these organic monoradicals studied using SQUID megnetometry. Almost of all the rare-earth-metal complexes show two-sublattice behavior in a wide range of antiferromagnetic (AFM) intrasublattice and ferromagnetic (FM) intersublattice interactions, Gamma and lambda, with vertical bar C Gamma vertical bar and vertical bar C lambda vertical bar. 10 to 100 K (C is the Curie constant) over the temperature range between 1.8 and 300 K, while the metal-free radicals exhibit only weak AFM intermolecular interactions, less than the Weiss constant theta = -1 K. The magnitude of interactions observed in the metal complexes of each radical increase in order from Gd to Dy to Nd complexes. [GRAPHICS] (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1205 / 1207

页数：3

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