title: Synthesis, spectroscopy and electrochemical behaviors of nickel(II) complexes with tetradentate shiff bases derived from 3,5-Bu(2)(t)-salicylaldehyde.
abstract: Nickel(II) complexes of a series of N,N'-polymethylenebis(3,5-Bu(2)(t)-salicylaldimine) ligands containing 2,4-di-Bu(2)(t)-phenol arms, NiL(x), were synthesized and their spectroscopic and redox properties were examined. The UV-vis, (1)H NMR spectroscopic and magnetic results indicate that complexes NiL(1)-NiL(4) unlike NiL(5) and NiL(6) have a square-planar structure in the solid state and in solution. Cyclic voltammograms of NiL(x) (x=1-4) complexes displayed two-step oxidation processes. The first oxidation peak potentials of all Ni(II) complexes corresponds to the reversible one-electron oxidation process of the metal center, yielding Ni(III) species. The second oxidation peak of the complexes was assigned as the ligand based oxidation generating a coordinated phenoxyl radical species.
authors.affiliation: Chemistry Department, Harran University, 63200 Sanliurfa, Turkey. vkasumov@harran.edu.tr
authors.forename: Veli T
authors.initials: VT
authors.lastname: Kasumov
authors.forename: Seniz
authors.initials: S
authors.lastname: Ozalp-Yaman
authors.forename: Eşref
authors.initials: E
authors.lastname: Taş
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D008958:Models, Molecular; D009532:Nickel; D010084:Oxidation-Reduction; D012545:Schiff Bases / Q000737:chemistry*; D013053:Spectrophotometry
chemical_list: D000447:Aldehydes; D012545:Schiff Bases; C013243:salicylaldehyde; D009532:Nickel