Stepwise Formation of a Pentanuclear Ni4Cu Heterometallic Complex Exhibiting a Vertex-Sharing Defective Double-Cubane Core and Diphenoxo- and Phenoxo/Azide Bridging Groups: A Magnetostructu

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• 作者：Koushik Pramanik ; Pijush Malpaharia ; Antonio J. Mota ; Enrique Colacio ; Babulal Das ; F. Lloret ; Swapan K. Chandra
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：April 1, 2013
• 年：2013
• 卷：52
• 期：7
• 页码：3995-4001
• 全文大小：356K
• 年卷期：v.52,no.7(April 1, 2013)
• ISSN：1520-510X

文摘

Sequential reaction of a N₅O₃ octadentate tripodal ligand with Ni²⁺ and subsequently with Cu²⁺ and azide ligand afforded the first example of a heterobridged (phenoxo/渭_1,1-azido) pentanuclear heterometallic (Ni₄Cu) compound, which exhibits a centrosymmetric vertex-sharing defective double-cubane structure. The study of the magnetic properties reveals that the compound shows ferromagnetic interaction interactions, leading to an S = ⁹/₂ spin ground state. Density functional theory calculations on the X-ray structure and model compounds predict ferromagnetic interactions through the magnetic exchange pathways involving each couple of metal ions.