A square-planar nickel(II) monoradical complex with a bis(salicylidene)- diamine ligand

Laurent Benisvy, Ramu Kannappan, Yu Fei Song, Sergey Milikisyants, Martina Huber, Ilpo Mutikainen, Urho Turpeinen, Patrick Gamez, Leonardo Bernasconi, Evert Jan Baerends, František Hartl, Jan Reedijk

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43 Scopus citations


The new square-planar NiII-N2O2 complex [Ni(MeL)] (1Me), where MeL stands for the dianionic phenolato form of N,N′-bis(3,5-di-tert-butyl-salicylidene)-4,5- dimethyl-1,2-phenylenediamine (MeLH2), has been synthesised and fully characterised. X-ray crystallography was also used for the characterisation. The electrochemical one-electron oxidation of 1Me produces the thermally stable (within the temperature range 10-295 K) cationic species (1Me)+. The UV/Vis and X-band EPR experimental data, supported by DFT calculations, indicate that (1Me)+ is best described as a NiII monoradical complex and, thus, does NOT exist in a NiIII ground state, in contrast to its demethylated counterpart [Ni(HL)]+ (1H)+ below 170 K.

Original languageEnglish
Pages (from-to)637-642
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Issue number5
StatePublished - 2007
Externally publishedYes


  • Density functional calculations
  • EPR spectroscopy
  • Nickel(II) complexes
  • Phenoxyl radicals
  • Redox chemistry
  • Spectroelectrochemistry


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