title: An isoreticular family of microporous metal-organic frameworks based on zinc and 2-substituted imidazolate-4-amide-5-imidate: syntheses, structures and properties.
abstract: We report on a new series of isoreticular frameworks based on zinc and 2-substituted imidazolate-4-amide-5-imidate (IFP-1-4, IFP = imidazolate framework Potsdam) that form one-dimensional, microporous hexagonal channels. Varying R in the 2-substitued linker (R = Me (IFP-1), Cl (IFP-2), Br (IFP-3), Et (IFP-4)) allowed the channel diameter (4.0-1.7 Å), the polarisability and functionality of the channel walls to be tuned. Frameworks IFP-2, IFP-3 and IFP-4 are isostructural to previously reported IFP-1. The structures of IFP-2 and IFP-3 were solved by X-ray crystallographic analyses. The structure of IFP-4 was determined by a combination of PXRD and structure modelling and was confirmed by IR spectroscopy and (1)H MAS and (13)C CP-MAS NMR spectroscopy. All IFPs showed high thermal stability (345-400 °C); IFP-1 and IFP-4 were stable in boiling water for 7 d. A detailed porosity analysis was performed on the basis of adsorption measurements by using various gases. The potential of the materials to undergo specific interactions with CO(2) was investigated by measuring the isosteric heats of adsorption. The capacity to adsorb CH(4) (at 298 K), CO(2) (at 298 K) and H(2) (at 77 K) at high pressure were also investigated. In situ IR spectroscopy showed that CO(2) is physisorbed on IFP-1-4 under dry conditions and that both CO(2) and H(2)O are physisorbed on IFP-1 under moist conditions.
authors.affiliation: Institut für Chemie, Anorganische Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany.
authors.forename: Franziska
authors.initials: F
authors.lastname: Debatin
authors.forename: Karsten
authors.initials: K
authors.lastname: Behrens
authors.forename: Jens
authors.initials: J
authors.lastname: Weber
authors.forename: Igor A
authors.initials: IA
authors.lastname: Baburin
authors.forename: Arne
authors.initials: A
authors.lastname: Thomas
authors.forename: Johannes
authors.initials: J
authors.lastname: Schmidt
authors.forename: Irena
authors.initials: I
authors.lastname: Senkovska
authors.forename: Stefan
authors.initials: S
authors.lastname: Kaskel
authors.forename: Alexandra
authors.initials: A
authors.lastname: Kelling
authors.forename: Niklas
authors.initials: N
authors.lastname: Hedin
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Bacsik
authors.forename: Stefano
authors.initials: S
authors.lastname: Leoni
authors.forename: Gotthard
authors.initials: G
authors.lastname: Seifert
authors.forename: Christian
authors.initials: C
authors.lastname: Jäger
authors.forename: Christina
authors.initials: C
authors.lastname: Günter
authors.forename: Uwe
authors.initials: U
authors.lastname: Schilde
authors.forename: Alwin
authors.initials: A
authors.lastname: Friedrich
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Holdt
mesh_terms: D000577:Amides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007093:Imidazoles / Q000737:chemistry*; D007096:Imidoesters / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry*
chemical_list: D000577:Amides; D007093:Imidazoles; D007096:Imidoesters; D009942:Organometallic Compounds; D015032:Zinc