Modulation of the Magnetic Properties of Two-Dimensional Compounds [NiX2(N鈥揘)] by Tailoring Their Crystal Structure

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• 作者：Miguel Cortijo ; Santiago Herrero ; Reyes Jim茅nez-Aparicio ; Emilio Matesanz
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：June 17, 2013
• 年：2013
• 卷：52
• 期：12
• 页码：7087-7093
• 全文大小：372K
• 年卷期：v.52,no.12(June 17, 2013)
• ISSN：1520-510X

文摘

A series of 2-D nickel compounds with the stoichiometry [NiCl₂(N鈥揘)] has been prepared, [N鈥揘 = pyrazine (1), 4,4鈥?bipyridine (2), <i>transi>-4,4鈥?azopyridine (3), <i>transi>-1,2-bis(4-pyridyl)ethylene (4), and 1,2-bis(4-pyridyl)ethane (5)]. The complex [NiBr₂(4,4鈥?bpy)] (6) was also obtained for comparative reasons. Compound 2 is the 尾 phase of the previously reported complex [NiCl₂(4,4鈥?bpy)]. The syntheses of complexes 1鈥?b>6 were carried out using solvothermal and microwave techniques. The compounds have been characterized by elemental analysis, infrared spectroscopy, thermogravimetry, and powder X-ray diffraction. The crystal structures of compounds 1, 4, and 5 have been solved using ab initio X-ray powder diffraction methods. Compounds 1鈥?b>6 show the same arrangement, and their structures are described as layers formed by [NiX₂] chains linked perpendicularly by N鈥揘 ligands. The magnetic properties of the compounds are explained as a balance between the ferromagnetic interactions along the [NiX₂] chains and the antiferromagnetic interactions between chains from different layers. This work demonstrates that this balance can be tuned by the length of the N鈥揘 ligand.