Abstract
Nickel(II) complexes of a series of N, N′-polymethylenebis(3,5- B u 2 t -salicylaldimine) ligands containing 2,4-di- B u 2 t -phenol arms, NiL x , were synthesized and their spectroscopic and redox properties were examined. The UV–vis, 1H 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.
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