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首页> 外文期刊>Crystal growth & design >Oxamido-bridged bimetallic complexes involving nitronyl nitroxide radical ligands: Crystal structure and magnetic behavior
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Oxamido-bridged bimetallic complexes involving nitronyl nitroxide radical ligands: Crystal structure and magnetic behavior

机译：含氮酰硝基氧自由基配体的酰胺基桥联双金属配合物：晶体结构和磁行为

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Two novel dinuclear copper(II) complexes containing four spin carriers have been synthesized and characterized structurally and magnetically. These complexes are formulated as [Cu-2(apox)(NIT-4Py)(2)](ClO4)(2)center dot 2H(2)O (1) and [Cu-2(apox)(NIT-2PY)(2)](ClO4)(2) (2), where apox = N,N-bis(3-aminopropyl) oxamido, NIT-4Py = 2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, and NIT-2Py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide. The structure of complexes 1 and 2 consists of centrosymmetric trans oxamido-bridged copper(II) binuclear units. In complex 1, the coordination geometry of the copper atom is distorted square plane and the radical ligands (NIT-4Py) coordinate to the copper atoms via the nitrogen atoms of the pyridine ring, whereas in complex 2, the coordination geometry around each copper atom is distorted square pyramidal and the apical position is occupied by an oxygen atom of the radical ligand. Magnetic analyses indicate that both compounds 1 and 2 exhibit strong antiferromagnetic coupling between copper(II) ions through the oxamido bridge and there are ferro- and antiferromagnetic exchange interactions between copper(II) ions and radical ligands for compounds 2 and 1, respectively.
机译：合成了两个含有四个自旋载体的新型双核铜（II）配合物，并对其结构和磁性进行了表征。这些配合物配制成[Cu-2（apox）（NIT-4Py）（2）]（ClO4）（2）中心点2H（2）O（1）和[Cu-2（apox）（NIT-2PY） （2）]（ClO4）（2）（2），其中apox = N，N-双（3-氨基丙基）草酰胺，NIT-4Py = 2-（4'-吡啶基）-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物，而NIT-2Py = 2-（2'-吡啶基）-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物。配合物1和2的结构由中心对称的反草酰胺桥铜（II）双核单元组成。在络合物1中，铜原子的配位几何结构是扭曲的方形平面，自由基配体（NIT-4Py）通过吡啶环的氮原子与铜原子进行配位，而在络合物2中，每个铜原子周围的配位几何结构原子被扭曲成方形锥体，顶端位置被自由基配体的氧原子占据。磁性分析表明，化合物1和2均通过草胺酰胺桥在铜（II）离子之间表现出强反铁磁耦合，并且铜（II）离子与化合物2和1的自由基配体之间存在铁磁和反铁磁交换相互作用。

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