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 {l_brace}[Cu{sub 4}(Iso){sub 4}({mu} {sub 3}-O){sub 2}(C{sub 2}H{sub 5}OH){sub 2}].2C{sub 2}H{sub 5}OH.C{sub 2}H{sub 6}N{sub 4}{r_brace} {sub n} (1), {l_brace}[Cd(Iso){sub 2}(H{sub 2}O)].OHCCHO{r_brace} {sub 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.