Self assembly of two novel three-dimensional supramolecular networks with blue photoluminescence

Abstract Two novel photoluminescent coordination polymers of the formula [Cd(Haip) 2 (H 2 O) 2 ] · 2H 2 O ( 1 ) and [Zn(aip)(atz)] · 3H 2 O ( 2 ) (H 2 aip = 5-aminoisophthalic acid; atz = 3-amino-1,2,4-triazole) have been synthesized through the self-assembly of metal(II) ions with H 2 aip and N -containing ligands [2-amino-5-mercapto-1,3,4-thiadiazole for 1 and 3-amino-1,2,4-triazole for 2 , respectively] in the presence of NaOH. These complexes were characterized by FT-IR spectroscopy, thermogravimetric analysis (TG), elemental analysis and X-ray analysis. X -ray crystallographic studies of the complexes reveal that 1 is a first example where only one carboxylate group of the H 2 aip ligand participates in coordination with the metal(II) ion and it exhibits a two-dimensional framework which further assembles into a three-dimensional supramolecular network via interlayer π–π stacking interactions and strong hydrogen bonds, while 2 exhibits a two-dimensional porous architecture. The extensively strong hydrogen bonds and interlayer π–π stacking interactions in 2 lead to the formation of a three-dimensional supramolecular network. Photoluminescence properties of the compounds 1 and 2 have been examined in the solid state at room temperature. These compounds have been found to exhibit blue photoluminescence and may be good candidates for photoactive materials.