Syntheses, structures and properties of copper(II) and cobalt(II) metal-organic frameworks based on R-isophthalate (R = -CH3 or -C(CH3)3) and 1,1′-(1,4-butanediyl)bis(imidazole) ligands |
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| Authors: | Lu-Fang Ma Li-Ya Wang Fu-Pei Liang |
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| Affiliation: | a College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, China
b College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, China |
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| Abstract: | Three new complexes [Cu2(mip)2(bbi)]n (1), {[Cu2(tbip)2(bbi)2(H2O)]·2H2O}n (2) and {[Co2(tbip)2(bbi)2]·2H2O}n (3), were prepared through hydrothermal reactions of Cu(II) and Co(II) acetate with H2mip or H2tbip (H2mip = 5-methyl isophthalic acid and H2tbip = 5-tert-butyl isophthalic acid) and the flexible ligand bbi (bbi = 1,1′-(1,4-butanediyl)bis(imidazole)). All these complexes were structurally characterized by elemental analysis, IR spectroscopy and X-ray single-crystal diffraction. Complex 1 exhibits a 3D network, which are constructed from 2D carboxylate layer and bbi pillar. Complex 2 possesses a 2D layer structure, and exists extensive hydrogen-bonding interactions, while complex 3 is constructed from 2D layers which consists of alternating left- and right-handed helical chains, and further assembled to form a 3D framework by hydrogen-bonding interactions. The thermal stabilities of the corresponding complexes have been briefly investigated. In addition, dominant antiferromagnetic coupling was observed in complex 1. |
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| Keywords: | Hydrothermal synthesis 5-Methyl isophthalic acid 5-Tert-butyl isophthalic acid Magnetic properties |
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