title: Metal-organic frameworks based on the [1,1':3',1''-terphenyl]-3,3'',5,5''-tetracarboxylic acid ligand: syntheses, structures and magnetic properties.
abstract: The solvothermal reactions of [1,1':3',1''-terphenyl]-3,3'',5,5''-tetracarboxylic acid (H4TPTA) with transition metal cations afforded five novel coordination polymers in the presence of three pyridine ligands (4,4'-bipy = 4,4'-bipyridine, 2,2'-bipy = 2,2'-bipyridine and phen = 1,10-phenanthroline), namely [M(TPTA)0.5(4,4'-bpy)0.5(H2O)2]n (M = Co for (1), Ni for (2)), {[Mn2(TPTA)(2,2'-bpy)H2O]·1.5H2O}n (3), and [M(H2TPTA)(phen)]n (M = Mn for (4), Co for (5)). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Polymers 1 and 2 are isomorphous and exhibit 3D 4-fold interpenetrated networks with the point Schläfli symbol of (4(2)·10(4)) (4·10(2)). Polymer 3 shows a 2D layer framework. Polymers 4 and 5 are also isomorphous and each displays a one-dimensional (1D) chain, which further forms a 2D supramolecular architecture via inter-chain π···π interactions. Moreover, variable-temperature magnetic susceptibilities of polymers 3-5 exhibit overall weak antiferromagnetic coupling between the adjacent M(II) ions.
authors.affiliation: The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, P. R. China. houhongw@zzu.edu.cn wujie@zzu.edu.cn.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Lv
authors.forename: Lu
authors.initials: L
authors.lastname: Liu
authors.forename: Chao
authors.initials: C
authors.lastname: Huang
authors.forename: Li'an
authors.initials: L
authors.lastname: Guo
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.forename: Hongwei
authors.initials: H
authors.lastname: Hou
authors.forename: Yaoting
authors.initials: Y
authors.lastname: Fan