Spectroscopic properties of some new azo–azomethine ligands in the presence of Cu2+, Pb2+, Hg2+, Co2+, Ni2+, Cd2+ and Zn2+ and their antioxidant activity

摘要: Abstract Due to their potential applicability as selective receptors in optical sensors, two novel azo Schiff-base derivatives I and II are synthesized characterized with FT-IR, 1 H NMR elemental analysis techniques. The response of groups towards Ni 2+ , Co Cu Pb Hg Zn Cd metal ions is studied DMSO by UV–vis spectroscopy. absorption spectra both compounds cations show marked changes. In solution, produces a cation induced 95 nm blue shift for ion from 555 nm 460 nm remarkable color change red yellow. Whereas no significant observed upon addition the solution ligand or other . Furthermore, Job’s plot indicate 1:1 binding-stoichiometry Benesi–Hildebrand used determination its association constant. Therefore receptor highly specific copper solution. Finally, study antioxidant properties DPPH method reveals high activities.