title: Nanoporous magnets of chiral and racemic [{Mn(HL)}2Mn{Mo(CN)7}2] with switchable ordering temperatures (TC = 85 K <--> 106 K) driven by H2O sorption (L = N,N-dimethylalaninol).
abstract: Molecule-based solids represent a rare opportunity to combine, adjust, and interrelate structural and physical functionalities to develop multifunctional materials. Here we report on a series of porous supramolecular magnets whose magnetic properties are related to their sorption state. A family of magnets of the formula [{Mn(HL)(H2O)}2Mn{Mo(CN)7}2].2H2O have been obtained by assembling the heptacyano-metalate building unit {Mo(CN)7}4- with Mn(II) in the presence of protonated N,N-dimethylalaninol (L) as ligand, the latter being either as a racemic mixture or as a chiral R- or S-enantiomer. The resulting magnets possess an open framework structure and exhibit a TC with a switching behavior (TC = 85 K <--> 106 K) as a function of the hydration state. Moreover, chiral magnets are formed with the optically active ligands. The H2O and gas (N2, CO2, CO) sorption features, the magnetic behavior of both the hydrated and dehydrated magnets, and the crystal structures of the hydrated chiral (S) and racemic magnets are described.
authors.affiliation: Laboratoire de Chimie de Coordination du CNRS, Université Paul Sabatier, 205, Route de Narbonne, F-31077 Toulouse, France.
authors.forename: Julie
authors.initials: J
authors.lastname: Milon
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Daniel
authors.forename: Abdellah
authors.initials: A
authors.lastname: Kaiba
authors.forename: Philippe
authors.initials: P
authors.lastname: Guionneau
authors.forename: Stéphane
authors.initials: S
authors.lastname: Brandès
authors.forename: Jean-Pascal
authors.initials: JP
authors.lastname: Sutter
mesh_terms: D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives* / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry; D018360:Crystallography, X-Ray; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008958:Models, Molecular; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D033362:Powder Diffraction; D013237:Stereoisomerism; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D008024:Ligands; C525680:N,N-dimethylalaninol; D009942:Organometallic Compounds; D014867:Water; D002245:Carbon Dioxide; D008345:Manganese; D002248:Carbon Monoxide; D008982:Molybdenum; D009584:Nitrogen; D000409:Alanine