Preparation and characterization of two three-dimensional metal–organic photoluminescent supramolecular networks

Two novel photoluminescent coordination compounds of the formula [Cd(atpt)phen(H2O)] · H2O (1) and [Zn2(atpt)2(bipy)2(H2O)2] (2) (H2atpt = 2-aminoterephthalic acid, bipy = 2,2′-bipyridine and phen = 1,10-phenanthroline) were synthesized through the self-assembly of H2atpt and N-containing ligands (bipy for 1 and phen for 2) with metal(II) ions in the presence of NaOH, and were characterized by FT-IR spectroscopy, thermogravimetric analysis (TG), X-ray analysis and photoluminescence spectra in the solid state. Compound 1 is the first structurally characterized Cd(II) complex with the atpt ligand. The coordination mode of the atpt ligand in 2 is novel and is first reported in this presentation. X-ray crystallographic studies reveal that compound 1 shows a 1D architecture. Compound 1 further assembles into a 3D supramolecular network via interchain hydrogen bonds and π–π stacking interactions. Compound 2 exhibits a binuclear structure with intramolecular π–π stacking interactions, which is further extended into a 3D supramolecular framework via intermolecular hydrogen bonds and C–H⋯π interactions. Compounds 1 and 2 exhibit green photoluminescence in the solid state at room temperature.

Graphical abstractTwo novel photoluminescent coordination compounds of the formula [Cd(atpt)phen(H2O)] · H2O (1) and [Zn2(atpt)2(bipy)2(H2O)2] (2) (H2atpt = 2-aminoterephthalic acid, bipy = 2,2′-bipyridine and phen = 1,10-phenanthroline) were synthesized through the self-assembly of H2atpt and N-containing ligands (bipy for 1 and phen for 2) with metal(II) ions in the presence of NaOH, and characterized by FT-IR spectroscopy, thermogravimetric analysis (TG), X-ray analysis and photoluminescence spectra in the solid state. The coordination mode of the atpt ligand in 2 is novel and is first reported in this presentation. Compound 1 shows a 1D architecture and further assembles into a 3D supramolecular network via interchain hydrogen bonds and π–π stacking interactions. Compound 2 exhibits a binuclear structure with intramolecular π–π stacking interactions, which is further extended into a 3D supramolecular framework via intermolecular hydrogen bonds and C–H⋯π interactions. Compounds 1 and 2 exhibit green photoluminescence in the solid state at room temperature.Figure optionsDownload full-size imageDownload as PowerPoint slide