A Family of Layered Chiral Porous Magnets Exhibiting Tunable Ordering Temperatures

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• 作者：Matteo Atzori ; Samia Benmansour ; Guillermo M铆nguez Espallargas ; Miguel Clemente-Le贸n ; Alexandre Abherv茅 ; Patricia G贸mez-Claramunt ; Eugenio Coronado ; Flavia Artizzu ; Elisa Sessini ; Paola Deplano ; Angela Serpe ; Maria Laura Mercuri ; Carlos J. G贸mez Garc铆a
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：52
• 期：17
• 页码：10031-10040
• 全文大小：497K
• 年卷期：v.52,no.17(September 3, 2013)
• ISSN：1520-510X

文摘

A simple change of the substituents in the bridging ligand allows tuning of the ordering temperatures, T_c, in the new family of layered chiral magnets A[M^IIM^III(X₂An)₃]路G (A = [(H₃O)(phz)₃]⁺ (phz = phenazine) or NBu₄⁺; X₂An^{2鈥?/sup> = C₆O₄X₂2鈥?/sup> = 2,5-dihydroxy-1,4-benzoquinone derivative dianion, with MIII = Cr, Fe; MII = Mn, Fe, Co, etc.; X = Cl, Br, I, H; G = water or acetone). Depending on the nature of X, an increase in T_c from ca. 5.5 to 6.3, 8.2, and 11.0 K (for X = Cl, Br, I, and H, respectively) is observed in the MnCr derivative. Furthermore, the presence of the chiral cation [(H₃O)(phz)₃]+, formed by the association of a hydronium ion with three phenazine molecules, leads to a chiral structure where the 螖-[(H₃O)(phz)₃]+ cations are always located below the 螖-[Cr(Cl₂An)₃]3鈥?/sup> centers, leading to a very unusual localization of both kinds of metals (Cr and Mn) and to an eclipsed disposition of the layers. This eclipsed disposition generates hexagonal channels with a void volume of ca. 20% where guest molecules (acetone and water) can be reversibly absorbed. Here we present the structural and magnetic characterization of this new family of anilato-based molecular magnets.}