title: Three-dimensional porous metal-organic frameworks exhibiting metamagnetic behaviors: synthesis, structure, adsorption, and magnetic properties.
abstract: Two isomorphous 3D porous metamagnets, {[M(6)(N(3))(12)L(6)].(H(2)O)(13)}(infinity) (M = Ni(II), 1; Co(II), 2), have been constructed from 2-(1,3,4-thiadiazol-2-ylthio)acetic acid (HL), with azido as the auxiliary ligand. Single-crystal X-ray analysis indicates that the complexes possess hexagonal channels with dimensions of about 8.3 A x 8.3 A along the c axis and void space of about 25% per cell volume. Hydrogen adsorption measurements at 740 Torr and 77 K reveal that hydrogen uptakes of 0.68 and 0.83 wt % were observed in 1 and 2, respectively, with BET surface areas of 309 and 328 m(2)/g. Magnetic measurement reveals that both of them exhibit global metamagnetic behaviors resulted from strong intrachain ferromagnetic couplings and weak interchain antiferromagnetic interactions, with critical fields of 22 kOe and 6 kOe for 1 and 2, respectively.
authors.affiliation: Department of Chemistry, and TKL of Metal- and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, P. R. China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Yu
authors.forename: Yong-Fei
authors.initials: YF
authors.lastname: Zeng
authors.forename: Jiong-Peng
authors.initials: JP
authors.lastname: Zhao
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.forename: Bo-Wen
authors.initials: BW
authors.lastname: Hu
authors.forename: Ze
authors.initials: Z
authors.lastname: Chang
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu
mesh_terms: D000085:Acetates / Q000737:chemistry*; D000327:Adsorption; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008280:Magnetics; D008958:Models, Molecular; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties; D013830:Thiadiazoles / Q000737:chemistry*
chemical_list: D000085:Acetates; D008024:Ligands; D009942:Organometallic Compounds; D013830:Thiadiazoles; D003035:Cobalt; D009532:Nickel