Electrochemistry of nickel(II) complexes with N,N'-bis(3,5-di-tert-butylsalicylidene)polymethylenediamines

Ozalp-Yaman S., Kasumov V., Onal A.

POLYHEDRON, cilt.24, sa.14, ss.1821-1828, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 14
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.poly.2005.05.024
  • Dergi Adı: POLYHEDRON
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1821-1828
  • Anahtar Kelimeler: spectroelectrochemistry, Ni(II) complexes, Schiff bases, Ni(III) species, EPR, SCHIFF-BASE LIGANDS, ELECTRON-SPIN-RESONANCE, NUCLEAR COMPLEXES, NI(II) COMPLEXES, REDUCTION, SPECTRA, COPPER(II), COBALT(II), OXIDATION, PRODUCTS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The electrochemical oxidation of several N,N'-polymethylenebis(3,5-di-tert- butylsalicylaldiminato)nickel(II) complexes, Ni(L-x), has been studied by cyclic voltammetry and in situ UV-Vis spectroscopy in DMF Cyclic voltammograms of Ni(L-x) (x = 1-4) complexes displayed two-step oxidation processes under nitrogen gas atmosphere. The first oxidation peak potentials of all the Ni(II) complexes corresponds to the reversible one-electron oxidation process of the metal center, yielding Ni(III) species. EPR spectrum of the electrolysis solution was recorded after one electron transfer at liquid nitrogen temperature also confirms the formation of [Ni-III (L-3)](+) species (g(x) > g(y) > g(z)) with a (2)A(1)(d(z)(2))(1) ground state. Upon addition of pyridine to one electron oxidised solutions a new penta coordinated species, [Ni-III(L-3)Py](+) (g(perpendicular to) > g(parallel to), a(parallel to)(N-14) = 8 G), was produced. The second oxidation peak of the complexes was assigned as the ligand based oxidation, generating a coordinated phenoxy radical species. (c) 2005 Elsevier Ltd. All rights reserved.