Esmail Tammari

A new macrocyclic chemosensor containing two naphthalene fluorophores has been synthesized. The fluorescent properties of this receptor has been studied in the presence of various metal ions such as Na , Ag , Cr3 , Mn2 , Fe3 , Co2 , Ni2 , Cu2 , Zn2 , Cd2 and Pb2 . When increasing concentrations of Zn2 ions were introduced, the emission of L was drastically increased (EFE = 4.34). This special change was not observed when other metal ions were used; such highly selective fluorescent response indicates that this receptor can easily discriminate Zn2 ions from other similar species. Model calculations at DFT level further suggest the possible interaction mode, and relatively steric position between the host and guest also influence the optical response.