Cd(II)-coordination polymers with isophthalic acid bearing a hydroxyphenylazo group and substituted bis(imidazole) linkers

Four novel hydrogen bonded Cd(II)-coordination polymers were synthesized with H3pdia and substituted bis(imidazole) linkers to investigate the effect of the substituted bis(imidazole) linker on the structural diversity. In 1, a 2D structure was formed by Hpdia and extended by hydrogen bonding to a 3D supramolecular network with the rtw topology. The hydrogen-bonded structure of 2 displayed a two-fold 3D → 3D interpenetrated supramolecular network. Compounds 3 and 4, prepared with semi-flexible substituted bis(imidazole) ligands, showed 1D and 3D frameworks, respectively. The thermal, optical and photoluminescence properties of the compounds were also studied.