Two novel 3-D coordination polymers based on isonicotinic acid: Syntheses, crystal structures and fluorescence

The hydrothermal reactions of isonicotinic acid (HIso) and metal salts yielded two novel 3-D coordination polymers {[Cu4(Iso)4(μ3-O)2(C2H5OH)2]·2C2H5OH·C2H6N4}n (1), {[Cd(Iso)2(H2O)]·OHCCHO}n (2), in which 1 was constructed from 32-membered rings and 3-D interpenetrating network of 2 from 42-membered rings. The fluorescent characterizations show the emissions at 565 nm for 1 and 440 nm for 2 possibly assigned to LMCT and IL, respectively.