title: A family of layered chiral porous magnets exhibiting tunable ordering temperatures.
abstract: A simple change of the substituents in the bridging ligand allows tuning of the ordering temperatures, Tc, in the new family of layered chiral magnets A[M(II)M(III)(X2An)3]·G (A = [(H3O)(phz)3](+) (phz = phenazine) or NBu4(+); X2An(2-) = C6O4X2(2-) = 2,5-dihydroxy-1,4-benzoquinone derivative dianion, with M(III) = Cr, Fe; M(II) = Mn, Fe, Co, etc.; X = Cl, Br, I, H; G = water or acetone). Depending on the nature of X, an increase in Tc 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 Δ-[(H3O)(phz)3](+) cations are always located below the Δ-[Cr(Cl2An)3](3-) 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.
authors: Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554, Bivio per Sestu, I09042 Monserrato, Cagliari, Italy.
authors: Matteo
authors: M
authors: Atzori
authors: Samia
authors: S
authors: Benmansour
authors: Guillermo
authors: G
authors: Mínguez Espallargas
authors: Miguel
authors: M
authors: Clemente-León
authors: Alexandre
authors: A
authors: Abhervé
authors: Patricia
authors: P
authors: Gómez-Claramunt
authors: Eugenio
authors: E
authors: Coronado
authors: Flavia
authors: F
authors: Artizzu
authors: Elisa
authors: E
authors: Sessini
authors: Paola
authors: P
authors: Deplano
authors: Angela
authors: A
authors: Serpe
authors: Maria Laura
authors: ML
authors: Mercuri
authors: Carlos J
authors: CJ
authors: Gómez García