Synthesis, Structure, and Luminescent and Dielectric Properties of Two Novel 1D Chains Based on a T-Shaped Tripodal Ligand 4-(4,5-Dicarboxy-1H-imidazol-2-yl)pyridine Loxide

Two 1D chain metal-organic framework complexes, {Co[(C10H5N3O5)-(H2O)(2)center dot H2O]}(n) (1) and {Cd[(C10H5N3O5)(H2O)(2)]}(n) (2), based on a T-shaped tripodal ligand 4-(4,5-dicarboxy- 1H-imidazol-2-yl) pyridine 1-oxide (H(3)DCImPyO) have been reacted under hydrothermal conditions, and were characterized by single-crystal X-ray structure analysis, fluorescent analysis and thermal gravimetric analysis. According to single-crystal X-ray determination, complex 1 crystallizes in the monoclinic system, space group P21/n with a = 9.4930(13), b = 13.2024(18), c = 10.5203(14) angstrom, beta = 98.402(2)degrees, Z = 4, V = 1304.4(3) angstrom(3); and complex 2 crystallizes in the monoclinic system, space group C2/c with a = 13.557(3), b = 13.568(3), c = 6.7804(13) angstrom, beta = 105.095(2)degrees, Z = 4 and V = 1204.2(4) angstrom(3). Fluorescent analysis of complex 2 showed an intense emission band at 466 nm when the exciting radiation was set at 360 nm. Dielectric constants of complexes 1 and 2 were measured at different frequencies with temperature variation.