title: Highly-connected, porous coordination polymers based on [M4(μ3-OH)2] (M = Co(II) and Ni(II)) clusters: different networks, adsorption and magnetic properties.
abstract: Two new 3D coordination polymers based on tetranuclear clusters, {[Co(4)(ina)(5)(μ(3)-OH)(2)(H(2)O)(EtOH)]-NO(3)·2EtOH·4H(2)O}(n) (1) (Hina = isonicotinic acid) and {[Ni(4)(ina)(5)(μ(3)-OH)(2)(EtCOO)]·6EtOH·2H(2)O}(n) (2), were obtained by the solvothermal reactions from Hina and different metal salts. The [M(4)(μ(3)-OH)(2)] cores act as 7- and 9-connected nodes and are extended through ina linkers to highly-connected frameworks with vmr net for 1 and bct-9-P2(1)/c net for 2. Both the desolvated frameworks display effective gas sorption capacities of N(2) and H(2) with Langmuir surface areas of 546 and 917 m(2) g(-1) for 1 and 2, respectively. Magnetic studies show spin canting and spin-glass behaviours with T(g) = 6.0 and 15.0 K for 1 and 2, respectively. The intra- and inter-tetramer coupling interactions and cooperative magnetic correlation greatly influence the bulk magnetic behaviours in this system.
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Xue
authors.forename: Jian-Bin
authors.initials: JB
authors.lastname: Lin
authors.forename: Rui-Biao
authors.initials: RB
authors.lastname: Lin
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Zeng
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008280:Magnetics; D009532:Nickel / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D033362:Powder Diffraction; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D011108:Polymers; D003035:Cobalt; D009532:Nickel