title: A New Structural Family of Gas-Sorbing Coordination Polymers Derived from Phenolic Carboxylic Acids.
abstract: The structure of Li(inox)⋅2/3 DMF (inox(-) =the N-oxide of the isonicotinate anion) consists of a 3D framework with solvent-filled, square cross-section channels of approximate dimensions 5.5×5.5 Å. Unfortunately, the Li(inox) framework is unstable upon removal of DMF from the channels. When the structurally related 4-hydroxybenzoic acid (H2 hba) was used in place of Hinox, and Zn(2+) in place of the Li(+) , a structurally similar but more robust network, Zn(hba), was obtained; the isostructural compound, Co(hba), may also be prepared. Longer ligands with phenolate and carboxylate functional groups at opposite ends, such as the dianions of 4-coumaric acid (H2 cma) and 4'-hydroxy-4-biphenylcarboxylic acid (H2 hbpc), in combination with Zn(2+) yield Zn(cma) and Zn(hbpc) frameworks, respectively, with the same PtS topology but with larger channels. The coordination polymers remain intact after desolvation and exhibit microporosity, showing the ability to sorb significant quantities of CO2 , CH4 , and H2 .
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010 (Australia).
authors.forename: Keith F
authors.initials: KF
authors.lastname: White
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010 (Australia). bfa@unimelb.edu.au.
authors.forename: Brendan F
authors.initials: BF
authors.lastname: Abrahams
authors.affiliation: Manufacturing Flagship, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Clayton, Victoria 3168 (Australia).
authors.forename: Ravichandar
authors.initials: R
authors.lastname: Babarao
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010 (Australia).
authors.forename: A David
authors.initials: AD
authors.lastname: Dharma
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010 (Australia).
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Hudson
authors.affiliation: Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2234 (Australia), Fax: (+61) 393475180.
authors.forename: Helen E
authors.initials: HE
authors.lastname: Maynard-Casely
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010 (Australia). r.robson@unimelb.edu.au.
authors.forename: Richard
authors.initials: R
authors.lastname: Robson
keywords: coordination polymers; crystal engineering; host networks; microporous materials; self-assembly