A dianionic dinickel(II) complex and its oxidised phenoxyl radical states

Laurent Benisvy, Riccardo Wanke, M. Fátima C. Guedes Da Silva, Armando J.L. Pombeiro

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12 Scopus citations


The new dianionic dinickel(II) complex [NBu4] 2[Ni2(L)2] {L3- = trianionic form of 3,5-di-tert-butyl-2-hydroxy-N-(2-hydroxyethyl)benzamide} has been synthesised and characterised by 1H, 13C NMR and IR spectroscopy, mass spectrometry, elemental analysis and X-ray crystallography. The X-ray structure of [NBu4]2[Ni2(L)2] ·EtOH·CH3CN reveals a quasiplanar dinickel(II) dianionic complex, each of the NiII ions possessing a NO3 planar coordination sphere that results from the ligation of L3- in a NO2 fashion through the N-amidate, O-phenolate and O-bridging alcoholate donor atoms. The cyclic voltammogram of [Ni2(L) 2]2- reveals two one-electron reversible oxidation processes at relatively low potentials. The EPR and UV/Vis spectroscopic characterisations of the electrochemically generated one-electron- and two-electron-oxidised products are consistent with two ligand-based oxidation processes leading to the formation of relatively stable mono- and diphenoxyl radical complexes, [Ni2(L·)(L)]- and [Ni2(L·)2], respectively.

Original languageEnglish
Pages (from-to)2791-2796
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Issue number18
StatePublished - Jun 2011


  • Anions
  • Nickel
  • Polyanionic ligands
  • Radicals
  • Redox chemistry


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