A series of 3d metal complexes prepared by in situ reactions of a flexible diacylhydrazine ligand: synthesis, structures and magnetic properties
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- 作者：Kai Wang ; Zi-Lu Chen ; Hua-Hong Zou ; Yan Li ; Fu-Pei Liang
- 刊名：Transition Metal Chemistry
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：42
- 期：1
- 页码：17-23
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry; Organometallic Chemistry;
- 出版者：Springer International Publishing
- ISSN：1572-901X
- 卷排序：42
文摘
The coordination reactions of 3d metal salts with malonic acid N,N′-bis(salicyloyl) bishydrazide (H6mbshz) afforded three complexes, namely [Cu2(H2bshz)(Py)4Cl2]·Py (1) (Py = pyridine), [Fe2(bshz)(Py)2] (2) and the known complex [Ni4(aehba)2(DMF)2(H2O)2]·2DMF (3), where bshz = N,N′-bis(salicyloyl)hydrazine anion and aehba4− = azo-enolic-2-hydroxybenzamide anion. The X-ray crystal structures of all three complexes have been obtained. Complexes 1 and 2 are composed of N–N-bridged binuclear units, while complex 3 displays a planar tetranuclear structure in which four Ni(II) centers are linked together by N–N and N=N bonds. The bshz anions in 1 and 2 and aehba4− anions in 3 were all generated in situ from H6mbshz. A mechanism for these reactions is proposed, involving tandem C–N cleavage and C–N/N–N coupling processes via free radical intermediates. Magnetic investigations revealed dominant antiferromagnetic interactions between the metallic centers of each complex.