| Abstract: In the presence of 2, 5-dimethoxyterephthalic acid (H2DTA), three 3D metal-organic frameworks, namely {[Zn(DTA) (1, 2, 4, 5-TIB) 0.5]·1.5H2O}n (1),[Zn(DTA) (1, 4-BMIB) 0.5(H2O)]n (2), and {[Zn(DTA) (1, 4-BMIN)]·H2O}n (3), have been synthesized by using imidazole derivatives 1, 2, 4, 5-tetra(1H-imidazol-1-yl) benzene (1, 2, 4, 5-TIB), 1, 4-bis(4-methyl-1H-imidazol-1-yl) benzene (1, 4-BMIB), and 1, 4-bis(4-methyl-1H-imidazol-1-yl) naphthalene (1, 4-BMIN) as ligands to react to zinc ions, respectively. Their structures and fluorescent properties were studied. Single crystal X-ray diffraction analysis reveals that all complexes belong to the monoclinic crystal system. Among them, complex 1 based on four-coordinated 1, 2, 4, 5-TIB is a four-connected framework with a point symbol of (62.84). Compared with complex 1, slim 1, 4-BMIB and 1, 4-BMIN ligands with low coordination numbers caused that complexes 2 and 3 are 2-fold interpenetration pcu-type and 3-fold interpenetration dia-type networks, respectively. Furthermore, the fluorescent properties of complexes 1-3 were also studied, and their emission spectra had a significant enhancement and blue shift compared to the emission peak of the ligands. |
