Crystal structure and magnetic properties of a linear tetranuclear Co^II cluster

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• 作者：Yingying Wang ; Meixia Wen ; Zhongjun Gao and Ning Sheng
• 关键词：tetranuclear cluster ; cobalt(II) ; crystal structure ; magnetic properties ; aminophenol ; ferromagnetic exchange interactions ; molecular magnets ; powder diffraction
• 刊名：Acta Crystallographica Section C
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：72
• 期：9
• 页码：697-700
• 全文大小：534K
• ISSN：1600-5759

文摘

Polynuclear complexes are an important class of inorganic functional materials and are of interest particularly for their applications in molecular magnets. Multidentate chelating ligands play an important role in the design and syntheses of polynuclear metal clusters. A novel linear tetranuclear Co^II cluster, namely bis{μ₃-(E)-2-[(2-oxidobenzylidene)amino]phenolato}bis{μ₂-(E)-2-[(2-oxidobenzylidene)amino]phenolato}bis(1,10-phenanthroline)tetracobalt(II), [Co₄(C₁₄H₁₁NO₂)₄(C₁₂H₈N₂)₂], was prepared under solvothermal conditions through a mixed-ligand synthetic strategy. The structure was determined by X-ray single-crystal diffraction and bulk purity was confirmed by powder X-ray diffraction. The complex molecule has a centrosymmetric tetranuclear chain-like structure and the four Co^II ions are located in two different coordination environments. The Co^II ions at the ends of the chain are in a slightly distorted octahedral geometry, while the two inner Co^II ions are in five-coordinate distorted trigonal bipyramidal environments. A magnetic study reveals ferromagnetic Co^II…Co^II exchange interactions for the complex.