Magnetic Differentiation of Pyrogallol[4]arene Tubular and Capsular Frameworks

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• 作者：Harshita Kumari ; Cindi L. Dennis ; Andrew V. Mossine ; Carol A. Deakyne ; Jerry L. Atwood
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：May 15, 2013
• 年：2013
• 卷：135
• 期：19
• 页码：7110-7113
• 全文大小：313K
• 年卷期：v.135,no.19(May 15, 2013)
• ISSN：1520-5126

文摘

The differences in magnetic properties of metal-based nanometric assemblies are due to distinct contributions from host鈥揼uest interactions, structural integrity, and magnetic interactions. To disentangle these contributions, it is necessary to control the self-assembly process that forms these entities. Herein we study the effect of host-to-guest ratios to identify remarkably different structural鈥搈agnetic contributions of C-methylpyrogallol[4]areneferrocene/(PgC₁)₂Fc dimers vs (PgC₁)₃Fc nanotubes. At low temperature, a weak anti-ferromagnetic alignment is observed, suggesting a weak dipolar interaction between Fc guest moieties within adjacent dimers or tubes. Also, differences are observed between magnetic atom occupancy as a function of guest (PgC₁Fc tube/dimer) versus magnetic atom occupancy within the framework wall (PgC₃Ni hexamer/dimer). Identification of the role of the framework shape and metal鈥搈etal distances in the crystal lattice opens up unparalleled prospects for materials engineering.