title: N,N,N,N-tetradentate macrocyclic ligand based selective fluorescent sensor for zinc (II).
abstract: N,N,N,N-tetradentate macrocyclic ligand (L) has been synthesized by the condensation of benzil and semicarbazide and characterized. On excitation by light of wavelength 350 nm, L exhibited a fluorescent peak at λ(max) = 454 nm, which showed ca 6 times enhancement in intensity with a blue shift on interaction with Zn(2+). L has been found to act as a selective fluorescent sensor for zinc(2+) ion over a host of other metal ions such as- Cd(2+), Pb(2+), Hg(2+), Ca(2+), Fe(2+), Na(2+), Co(2+), Mn(2+), Cu(2+) and Ni(2+), in 1:1 CH(3)OH:H(2)O. A 1:1 complex formation between L and Zn(2+) was proved. The enhancement in the fluorescence could be explained on the basis of Photo induced electron transfer (PET) mechanism with log β = 1.86.
authors.affiliation: Department of Chemistry, Gauhati University, Guwahati, 781 014, Assam, India.
authors.forename: Priyanka
authors.initials: P
authors.lastname: Goswami
authors.forename: Diganta Kumar
authors.initials: DK
authors.lastname: Das
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008024:Ligands; D047028:Macrocyclic Compounds / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D008024:Ligands; D047028:Macrocyclic Compounds; D015032:Zinc; D009584:Nitrogen