title: Novel Co-based metal-organic frameworks and their magnetic properties using asymmetrically binding 4-(4'-carboxyphenyl)-1,2,4-triazole.
abstract: Two novel Co-based metal-organic frameworks (MOFs) were synthesised and characterised using an asymmetrically binding ligand, 4-(4'-carboxyphenyl)-1,2,4 triazole (Hcpt). The isolated [Co3(II)(μ3-O)(OH)(cpt)3(H2O)2]n·xH2O·yDMF, Co-MOF1, exhibits a rhombohedral crystal structure (space group, P63/mc), with a trinuclear cobalt core that resembles the MIL88 series. This MOF shows paramagnetic behaviour down to 2 K with no saturation of magnetisation up to 7 T. This is presumably due to a geometrically frustrated triangular arrangement of Co spins. The two-dimensional complex, [Co(II)(cpt)(N3)]n, Co-MOF2, crystallises in a monoclinic crystal system (space group, C2/m). The magnetic measurements reveal metamagnetic behaviour for this complex with a critical field in the range of 700-1000 Oe.
authors.affiliation: Department of Chemistry, University of Ottawa, 10 Marie Curie Private, Ottawa, ON, Canada K1N 6N5.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Aharen
authors.forename: Fatemah
authors.initials: F
authors.lastname: Habib
authors.forename: Ilia
authors.initials: I
authors.lastname: Korobkov
authors.forename: Tara J
authors.initials: TJ
authors.lastname: Burchell
authors.forename: Rémy
authors.initials: R
authors.lastname: Guillet-Nicolas
authors.forename: Freddy
authors.initials: F
authors.lastname: Kleitz
authors.forename: Fredy
authors.initials: F
authors.lastname: Kleiz
authors.forename: Muralee
authors.initials: M
authors.lastname: Murugesu
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D059346:Magnets / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D014230:Triazoles; C045575:1,2,4-triazole; D003035:Cobalt