An Ionic Dysprosium Complex Made of a Hexanuclear Dy6 Cationic Cluster and a Mononuclear Dy Anionic Unit

被引:11
作者
Costes, Jean-Pierre [1 ,2 ,3 ]
Duhayon, Carine [1 ,2 ,3 ]
机构
[1] CNRS, Chim Coordinat Lab, F-31077 Toulouse 4, France
[2] Univ Toulouse, F-31077 Toulouse 4, France
[3] INPT, UPS, F-31077 Toulouse 4, France
关键词
Hydrazide ligands; Dysprosium; Magnetic properties; Topology; Anisotropy; Lanthanides; SINGLE-MOLECULE MAGNETS; DYNAMICS; LIGAND; RELAXATION; ANISOTROPY; BEHAVIOR; SPIN;
D O I
10.1002/ejic.201402622
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A genuine 2-hydroxy-N-{[3-(hydroxyimino)butan-2-ylidene]}benzohydrazide ligand, characterized by H-1, C-13, and N-15 NMR spectroscopy and chemical analysis, has been used to synthesize a novel ionic dysprosium species. The structural determination confirms the existence of a hexanuclear Dy cationic entity along with a mononuclear Dy anionic unit. The topological analysis of the hexanuclear cluster indicates that it corresponds to a 2,4M6-1 graph, observed for the first time for Dy complexes. The electrostatic model for the determination of the magnetic anisotropy in Dy complexes implemented in the Magellan program confirms that it is difficult to control the orientation of the different anisotropy axes of the six Dy ions in order to obtain large anisotropy in polynuclear Dy entities, which is in agreement with the ac susceptibility measurements that show frequency-dependent signals and absence of maxima for the out-of-phase susceptibility signals above 2 K, even under a dc bias field of 0.1 T or 0.2 T.
引用
收藏
页码:4745 / 4749
页数:5
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