Syntheses, Structures, and Properties of Four New Metal-Organic Frameworks Bases on Imidazole Ligands and 5-Amino-2,4,6-triodoisophthalic Acid

Abstract

Four metal-organic coordination polymers, [Zn(L1)2(L2)2]n (1), [Cd(L1)2(L2)2(H2O)2]n (2), [Ni(L1)2(L2)2(H2O)2]n (3), and [Co(L1)2(L2)2(H2O)2]n (4), (L1 = 4,4,bis(1-imidazoly)biphenyl, L2 = 5-amino-2, 4, 6-triodoisophthalic acid) have been hydrothermally synthesized and characterized by elemental analyses, IR, TG, PXRD, luminescent properties and single-crystal X-ray diffraction. X-ray structure analysis reveals that 1 is a 2D coordination polymer, while 2, 3, and 4 are 1D coordination polymers. The 3D structures of the four complexes are stabilized by π-π stacking and hydrogen-bonds.