Syntheses, Structures, and Sorption Properties of Metal-Organic Frameworks with 1,3,5-Tris(1-imidazolyl)benzene and Tricarboxylate Ligands

Seven new frameworks [Co-3(tib)(2)(BPT)(2)-(H2O)(2)]center dot DMA center dot 2.5H(2)O (1), [Co-3(tib)(2)(BPT)(2)(H2O)(2)]center dot DMF center dot 3H(2)O (2), [Ni-3(tib)(2)(BPT)(2)(H2O)(2)]center dot DMF-1.5H(2)O (3), [Ni-3(tib)(2)(BPT)(2)(H2O)(6)]center dot 2H(2)O (4), [Mn(tib)(H2O)(3)]center dot HBPT center dot DMF center dot 2H(2)O (5), [Ni-3(tib)(2)(BTB)(2)(H2O)(2)]center dot 14H(2)O (6), and [Co-3(tib)(2)(BTB)(2)]center dot 2DMF center dot 6H(2)O (7) [tib = 1,3,5-tris(1-imidazoly)benzene, H3BPT = biphenyl-3,4',5-tricarboxylic acid, H3BTB = 4,4',4 ''-benzene-1,3,5-triyl-tribenzoic acid, DMA = N,N-dimethylacetamide, DMF = N,N-dimethylformamide] were achieved and structurally characterized. 1, 2, and 3 are (3,3,4,4) -connected three-dimensional (3D) frameworks with a point symbol of {8(3)}(4){8(5).12}{8(6)}(2), while 4, 6, and 7 are also (3,3,4,4) -connected 3D nets but with different framework structures and topologies. S is a two-dimensional network, which is further joined together by hydrogen bonds to generate a 3D supramolecular framework. Gas, vapor, and dye adsorption properties of the frameworks were examined, and 1-7 exhibit hysteretic and selective adsorption of CO2 over N-2. Furthermore, 7 is a potential adsorbent for removing methylene blue in the aqueous solution.