title: Gas adsorption and structural diversity in a family of Cu(II) pyridyl-isophthalate metal-organic framework materials.
abstract: A family of Cu(II)-based metal-organic frameworks (MOFs) has been synthesized using three pyridyl-isophthalate ligands, H2L1(4'-(pyridin-4-yl)biphenyl-3,5-dicarboxylic acid), H2L2(4''-(pyridin-4-yl)-1,1':4',1''-terphenyl-3,5-dicarboxylic acid) and H2L3(5-[4-(pyridin-4-yl)naphthalen-1-yl]benzene-1,3-dicarboxylic acid). Although in each case the pyridyl-isophthalate ligands adopt the same pseudo-octahedral [Cu2(O2CR)4N2] paddlewheel coordination modes, the resulting frameworks are structurally diverse, particularly in the case of the complex of Cu(II) with H2L3, which leads to three distinct supramolecular isomers, each derived from Kagomé and square nets. In contrast to [Cu(L2)] and the isomers of [Cu(L3)], [Cu(L1)] exhibits permanent porosity. Thus, the gas adsorption properties of [Cu(L1)] were investigated with N2, CO2and H2, and the material exhibits an isosteric heat of adsorption competitive with leading MOF sorbents for CO2[Cu(L1)] displays high H2adsorption, with the density in the pores approaching that of liquid H2This article is part of the themed issue 'Coordination polymers and metal-organic frameworks: materials by design'.
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
authors.forename: Jamie A
authors.initials: JA
authors.lastname: Gould
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
authors.forename: Harprit Singh
authors.initials: HS
authors.lastname: Athwal
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
authors.forename: William
authors.initials: W
authors.lastname: Lewis
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
authors.forename: Peter
authors.initials: P
authors.lastname: Hubberstey
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK neil.champness@nottingham.ac.uk.
authors.forename: Neil R
authors.identifier: http://orcid.org/0000-0003-2970-1487
authors.initials: NR
authors.lastname: Champness
authors.affiliation: School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK m.schroder@manchester.ac.uk.|School of Chemistry, University of Manchester, Oxford Road, Manchester M19 3PL, UK.
authors.forename: Martin
authors.initials: M
authors.lastname: Schröder
keywords: copper; gas adsorption; metal–organic framework; pyridyl-isophthalate