title: A 3D porous cobalt-organic framework exhibiting spin-canted antiferromagnetism and field-induced spin-flop transition.
abstract: Two 3D cobalt-organic frameworks formulated as [Co3(2,4-pydc)2(micro3-OH)2]n.5nH2O (1) and [Co3(2,4-pydc)2(micro3-OH)2(H2O)]n.7nH2O (2) (2,4-pydc=pyridine-2,4-dicarboxylate) have been hydrothermally synthesized and characterized. Both compounds 1 and 2 exhibit the 3D porous frameworks with hydroxyl-bridged metal Delta-chains. However, in comparison with only two crystallographically independent CoII ions in a unit of 2, three crystallographically independent CoII ions are found in an asymmetric unit of 1, where their Delta-chains are constructed by two types of vertexes sharing quadrangles formed via edge-sharing triangles. Magnetic studies show that 1 exhibits spin-canted antiferomagnetism and a field-induced spin-flop transition while 2 behaves as a normal antiferromagnet. The magnetic properties are largely retained by the porous frameworks of dehydrated 1 and 2 compounds. Gas adsorption measurements indicate that both the dehydrated compounds absorb H2 into their pores.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China.
authors.forename: You-Gui
authors.initials: YG
authors.lastname: Huang
authors.forename: Da-Qiang
authors.initials: DQ
authors.lastname: Yuan
authors.forename: Long
authors.initials: L
authors.lastname: Pan
authors.forename: Fei-Long
authors.initials: FL
authors.lastname: Jiang
authors.forename: Ming-Yan
authors.initials: MY
authors.lastname: Wu
authors.forename: Xu-Dong
authors.initials: XD
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Jeong Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Mao-Chun
authors.initials: MC
authors.lastname: Hong