Selective extraction of palladium(II) using hydrazone ligand: A novel fluorescent sensor

► Ligand quinoline-2-carboxaldehyde 2-pyridylhydrazone as a blue light emitting species. ► New fluorescent chemosensor for Pd2+. ► Selective extraction of palladium(II) from aqueous solution in the presence of the excess of other metal ions (Co2+, Fe2+, Ni2+, Cu2+ and Zn2+).