title: A novel Schiff base: Synthesis, structural characterisation and comparative sensor studies for metal ion detections.
abstract: A novel Schiff base ligand was synthesized by the condensation reaction of 2,6-diformylpyridine and 4-aminoantipyrine in MeOH and characterised by its melting point, elemental analysis, FT-IR, (1)H, (13)C NMR and mass spectroscopic studies. Molecular structure of the ligand was determined by single crystal X-ray diffraction technique. The electrochemical properties of the Schiff base ligand were studied in different solvents at various scan rates. Sensor ability of the Schiff base ligand was investigated by colorimetric and fluorometric methods. Visual colour change of the ligand was investigated in MeOH solvent in presence of various metal ions Na(+), Mg(2+), Al(3+), K(+), Cr(3+), Mn(2+), Fe(3+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+), Hg(2+) and Pb(2+). Upon addition of Al(3+) ion into a MeOH solution of the ligand, an orange colour developed which is detectable by naked eye. Fluorescence emission studies showed that the ligand showed single emission band at 630-665nm upon excitation at 560nm. Addition of metal ions Na(+), Mg(2+), K(+), Cr(3+), Mn(2+), Fe(3+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+), Hg(2+) and Pb(2+) (1:1M ratio) cause fluorescence quenching, however addition of Al(+3) resulted in an increase in fluorescence intensity. No significant variation was observed in the fluorescence intensity caused by Al(3+) in presence of other metal ions. Therefore, the Schiff base ligand can be used for selective detection of Al(3+) ions in the presence of the other metal ions studied.
authors.affiliation: Department of Chemistry, Kahramanmaraş Sütçü Imam University, Kahmaranmaraş 46050, Turkey. Electronic address: muhammetkose@ksu.edu.tr.
authors.forename: Muhammet
authors.initials: M
authors.lastname: Köse
authors.affiliation: Department of Chemistry, Kahramanmaraş Sütçü Imam University, Kahmaranmaraş 46050, Turkey.
authors.forename: Savas
authors.initials: S
authors.lastname: Purtas
authors.affiliation: Department of Chemistry, Kahramanmaraş Sütçü Imam University, Kahmaranmaraş 46050, Turkey.
authors.forename: Seyit Ali
authors.initials: SA
authors.lastname: Güngör
authors.affiliation: Department of Chemistry, Kahramanmaraş Sütçü Imam University, Kahmaranmaraş 46050, Turkey.
authors.forename: Gökhan
authors.initials: G
authors.lastname: Ceyhan
authors.affiliation: Department of Chemistry, Kahramanmaraş Sütçü Imam University, Kahmaranmaraş 46050, Turkey.
authors.forename: Eyup
authors.initials: E
authors.lastname: Akgün
authors.affiliation: Department of Chemistry, Loughborough University, Leicestershire LE113TU, UK.
authors.forename: Vickie
authors.initials: V
authors.lastname: McKee
keywords: Colorimetric and fluorometric sensor; Schiff base; Structural characterisation; Visual detection