Magnetic Slow Relaxation in Cyclic TbIII-Nitronyl Nitroxide Radical Complexes

被引:74
作者
Tian, Haixia [1 ]
Liu, Ruina [1 ]
Wang, Xiaoling [1 ]
Yang, Peipei [1 ]
Li, Zuoxi [1 ]
Li, Licun [1 ]
Liao, Daizheng [1 ]
机构
[1] Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
基金
中国国家自然科学基金;
关键词
Radicals; Nitronyl nitroxide; Lanthanides; Terbium; Magnetic properties; Single molecule magnet; SINGLE-MOLECULE MAGNETS; HIGH-SPIN MOLECULES; ANISOTROPY; MANGANESE; DYNAMICS; BEHAVIOR; CRYSTAL; DIMER; IONS;
D O I
10.1002/ejic.200900584
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Two nitronyl nitroxide radical-Tb-III complexes, [Tb(hfac)(3)-(NIT-3Py)](2) (1) and [Tb(hfac)(3)(NIT-4Py)](2) (2) [hfac = hexafluoroacetylacetonate; NIT-3Py = 2-(3'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide; NIT-4Py = 2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl. 3-oxide] have been synthesized Both complexes possess cyclic duller structure in which each pyridyl-substituted radical links two different metal inns through the oxygen of nitroxide group and the pyridine nitrogen DC magnetic studies show the Tb-III ion interacts ferromagnetically with the directly bonding nitronyl nitroxide Complex 1 exhibits magnetic slow relaxation resembling SMM behavior, while there are no clearly the frequency-dependent out-of-phase signals for complex 2 ((C) Wiley-VCH Verlag GmbH & Co KGaA, 69451 Weinheim, Germany, 2009)
引用
收藏
页码:4498 / 4502
页数:5
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