Metal-organic frameworks with 1,3,5-tris(1-imidazolyl)benzene and dicarboxylate ligands: Synthesis, anion exchange and gas adsorption

• Metal-organic frameworks with mixed organic ligands have been obtained.
• The frameworks show 1D chain, non- and three-fold interpenetrated 3D structures.
• Anion exchange and sorption properties of the frameworks were investigated.

Six new metal-organic frameworks [M2(tib)2(bpdc)(H2O)2]·SO4·2H2O [M = Ni (1), Co (2), Cu (3)], [Co(tib)(dnbpdc)(H2O)]·DMF·H2O (4), [M2(tib)2(bpndc)(H2O)5]·(bpndc)·5H2O [M = Ni (5), Mn (6)], [tib = 1,3,5-tris(1-imidazolyl)benzene, H2bpdc = 4,4′-biphenyldicarboxylic acid, H2dnbpdc = 2,2′-dinitro-4,4′-biphenyldicarboxylic acid, H2bpndc = 4,4′-benzophenonedicaboxylic acid, DMF = N,N-dimethylformamide] have been synthesized and characterized by single-crystal and powder X-ray diffractions, infrared spectra (IR), elemental and thermogravimetric analyses. Complexes 1, 2 and 3 are (3, 4)-connected 2-nodal three-dimensional (3D) frameworks with point (Schläfli) symbol of {4·6·8}{4·62·8·102}, while 4 is one-dimensional (1D) chain, which is further linked together by hydrogen bonding interactions to give a 3D framework. Complexes 5 and 6 are 3D frameworks with the point (Schläfli) symbol of {4·142}. Anion exchange and adsorption properties of 1 were studied.

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