title: Four new 3D metal-organic frameworks constructed by the asymmetrical pentacarboxylate: gas sorption behaviour and magnetic properties.
abstract: By using an asymmetrical rigid pentacarboxylic acid ligand, 2,4-di(3',5'-dicarboxylphenyl)benzoic acid (H5L), four new three-dimensional (3D) metal-organic frameworks (MOFs), namely {[Cu2(HL)(H2O)2]·2DMF·2H2O}n(1), {[Co2(L)(DMA)]·H2N(Me)2}n(2), {[Co2(L)(H2O)]·H2N(Me)2}n(3), {[Mn2(L)(DMF)(H2O)]·H2N(Me)2}n(4), were solvothermally synthesized. H5L in 1-4 shows different coordination modes and can easily form various metal clusters (secondary building units, SBUs) in the final structures. 1 is a 3D porous framework with a (4,4)-connected pts topology based on the [Cu2(COO)4] paddlewheel SBU, wherein six SBUs are connected by twelve HL4-to get an unprecedented Cu12hendecahedron nanocage. 2-4 possess similar dinuclear [M2(COO)5] SBUs (M = Co, Mn), which are further extended by L5-to give rise to 3D frameworks with the uncommon (5,5)-connected nia-5,5-P21/c and bnn topologies. In addition, the desolvated framework of 1 contains polar channels decorated with uncoordinated carboxylate groups, leading to selective adsorption for CO2over CH4at 195, 273 and 298 K. Moreover, the magnetic properties of 1-4 show that there exist antiferromagnetic interactions between metal ions.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Yang-Tian
authors.initials: YT
authors.lastname: Yan
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Wen-Yan
authors.initials: WY
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Yun-Long
authors.initials: YL
authors.lastname: Wu
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Jiang
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Zheng-Ping
authors.initials: ZP
authors.lastname: Xi
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Yao-Yu
authors.initials: YY
authors.lastname: Wang
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. zhangwy@nwu.edu.cn lhou2009@nwu.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Hou