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Syntheses, structural diversity, magnetic properties and dyes absorption of various Co(II) MOFs based on a semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid†

Abstract

Five novel Co(II) metal-organic frameworks (MOFs) constructed by the semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid (H3L), namely {[Co1.5(HL)(4,4'-bidpe)2(H2O)]·3H2O}n (1), {[Co3(L)2(4,4'-bibp)32-O)2]·2H2O}n (2), {[Co(HL)(1,3-bitl)]·(1,4-Diox)}n (3), [Co2(HL)2(3,5-bipd)2]n (4), {[Co(HL)(tib)]·0.5H2O·NMP}n (5) (4,4'-bidpe = 4,4′-bis(imidazolyl)diphenyl ether, 4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl, 1,3-bitl = 1,3-bis(1-imidazoly)toluene, 3,5-bipd = 3,5-bis(1-imidazoly)pyridine, tib = 1,3,5 -tris(1-imidazolyl) benzene), were synthesized under solvothermal conditions and further characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Different architectural topologies have been generated by adjusting the N-donor ligands. Single-crystal X-ray diffraction analysis reveals that complex 1 shows a rare 1D → 2D polyrotaxane network. Complex 2 possesses an unprecedented 2-nodal (3,10)-connected 3D framework with a Schläfli symbol of (43)2(46·632·83)(43)2. When the 2-connected points (H3L and 1,3-bitl ligands) are not calculated, complex 3 shows a hcb uninodal 3-connected 2D network with the Schläfli symbol (63), which further constructs a 3D supramolecular structure through O-H···O hydrogen bonds; while the 2-connected points are taken in account, complex 3 exhibits an unprecedented 3-nodal (2,2,4)-connected network. Complex 4 presents an unprecedented 2-nodal (3,5)-connected 3D framework with a (4·62)(4·66·83) topology, while complex 5 exhibits another unprecedented 2-nodal (3,5)-connected 2D framework with a (42·67·8)(42·6) Schläfli symbol and shows 2D → 3D supramolecular structure through O-H···O hydrogen bonds. Meanwhile, the magnetic properties of complexes 2 and 4 are discussed. Moreover, the dyes adsorption and mechanism studies indicate that pore size, uncoordinated O atoms in carboxyl groups and uncoordinated carboxyl groups of the MOFs have significant effects on the dyes adsorption capacity.

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Publication details

The article was received on 03 Jul 2017, accepted on 04 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7CE01229B
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Syntheses, structural diversity, magnetic properties and dyes absorption of various Co(II) MOFs based on a semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid†

    X. Meng, L. Cui, X. Wang, X. Zhang, X. Zhang and S. Bi, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01229B

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