Synthesis and electrochemical studies of octahedral nickel β-diketonate complexes

Phimphaka Harding, David J Harding, Wasinee Phonsri, Saowanit Saithong, Hirihattaya Phetmung

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The reaction of [Ni(tmhd)2] and [Ni(dbm)2] with N-donor chelating ligands in dichloromethane and acetone, respectively, yields the complexes [Ni(tmhd)2(L-L)] (L-L = 2,2′-bpy 1, phen 2 and dmae 3) and [Ni(dbm)2(L-L)] (L-L = 2,2′-bpy 4, phen 5, dmae 6). UV-Vis spectroscopy shows very strong bands in the UV region consistent with ligand centred π → π* transitions. The electrochemical studies of 1-6 reveal oxidation to Ni(III). The [Ni(tmhd)2(L-L)] 1-3 are more easily oxidized by ca. 300 mV and are quasi-reversible whereas for the [Ni(dbm)2(L-L)] series only complex 6 shows significant reversibility. X-ray crystallographic studies have been conducted in the case of [Ni(dbm)2(phen)] 5 and [Ni(dbm)2(dmae)] 6. The structures both show that the nickel metal centre is octahedral with an O4N2 coordination environment. In the structures the β-diketonate ligands exhibit a cis-arrangement, with the metal displaced out of the planar chelate ring.

Original languageEnglish
Pages (from-to)78-82
Number of pages5
JournalInorganica Chimica Acta
Issue number1
Publication statusPublished - 1 Jan 2009
Externally publishedYes


  • β-Diketonates
  • Crystal structure
  • Cyclic voltammetry
  • Ni(II) and Ni(III)
  • Octahedral

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