摘要
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The supramolecular reactions of tetrabromoterephthalic acid (H-2-TBTA) with a series of N-heterocycles afforded eight new complexes, namely, [(H-2-BTAH)(2)center dot(TBTA)center dot(H-2-TBTA)] (1), [(H-2-Bim)(2)center dot(TBTA)cen...
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The supramolecular reactions of tetrabromoterephthalic acid (H-2-TBTA) with a series of N-heterocycles afforded eight new complexes, namely, [(H-2-BTAH)(2)center dot(TBTA)center dot(H-2-TBTA)] (1), [(H-2-Bim)(2)center dot(TBTA)center dot(H-2-TBTA)center dot 2H(2)O] (2), [(H-8-HQ)(2)center dot(TBTA)center dot 3H(2)O] (3), [(5-NO2-phen) 2 center dot(H-2-TBTA)] (4), [(4,6-DHP)(2)center dot(H-2-TBTA)center dot 2H(2)O] (5), [(H-2-2,4-DMI)(2)center dot(TBTA)center dot(H-2-TBTA)(2)] (6), [(H-2-3,5-DMP)(2)center dot(TBTA)] (7), and [(H-4-CNpy) 2 center dot(TBTA)center dot(H-2-TBTA)] (8) (H-BTAH = 1H-benzotriazole, H-Bim = 1H-benzimidazole, 8-HQ = 8-hydroxyquinoline, 5-NO2-phen = 5-nitro-1,10-phenanthroline, 4,6-DHP = 4,6-dihydroxypyrimidine, H-2,4-DMI = 2,4-dimethylimidazole, H-3,5-DMP = 3,5-dimethylpyrazole, and 4-CNpy = 4-cyanopyridine), which have been prepared under mild and identical reaction conditions in a mixture of distilled water and ethanol. All the complexes were fully characterized using single crystal X-ray diffraction analysis, elemental analysis, infrared spectroscopy (IR), and thermogravimetric analysis (TGA). Combining the various N-containing ligands and the diversity of the hydrogen bonds, the eight crystals display amusing structural characteristics. Among these complexes, complex 3 forms a three-dimensional (3D) network through the C-H center dot center dot center dot Br bonds, while the O-H center dot center dot center dot Br bonds facilitate the 3D construction of compound 2. Complexes 4-8 generate 3D supramolecular structures by utilizing a large number of hydrogen bonds. In crystal 1, the pi-pi stacking interactions play an important part in the 3D network. The thermal stability of crystals 1-8 has been investigated by thermogravimetric analysis (TGA) of mass loss.
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