Preparation and characterization of two novel three-dimensional supramolecular networks with blue photoluminescence

Two novel photoluminescent coordination polymers of formula [Cd(atpt)(H2O)(2)] center dot 2H(2)O (1) and [Zn(atpt)(H2O)(2)] (2) (H(2)atpt = 2-aminoterephthalic acid), in which the amino group of the atpt ligand coordinates to the metal(II) ions for the first time, have been synthesized through the self-assemblies of H(2)atpt and N-containing ligands [nicotiamide for 1 and imidazole for 2, respectively] with the metal(II) ions in the presence of NaOH. These complexes were characterized by FT-IR spectroscopy, thermogravimetric analysis JG), elemental analysis and X-ray analysis. X-ray crystallographic studies of the complexes reveal that complex 1 is a double stranded one-dimensional chain, which further assembles into a three-dimensional supramolecular network via the interchain pi-pi stacking interaction and strong hydrogen bonds, while complex 2 exhibits a two-dimensional porous architecture. The extensively strong hydrogen bonds in complex 2 lead to the formation of three-dimensional supramolecular framework. Photoluminescence properties of the compounds 1 and 2 have been examined in solid state at room temperature. These compounds have been found to exhibit blue photoluminescence and may be good candidates for photoactive materials. (c) 2007 Elsevier B.V. All rights reserved.