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Synthesis and Electrochemical Studies of Nickel β-Diketonate Complexes Incorporating Asymmetric Diimine Ligands
Phimphaka
Harding A D,
David J.
Harding A D,
Nitisastr
Soponrat B,
Kittiya
Tinpun B,
Sirirat
Samuadnuan B,
Harry
Adams C
A
Molecular Technology Research Unit, School of Science, Walailak University, Thasala, Nakhon Si Thammarat, 80161, Thailand.
B
Department of Chemistry, Faculty of Science, Taksin University, Songkhla, 90000, Thailand.
C
Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, UK.
D
Corresponding authors. Email: kphimpha@wu.ac.th; hdavid@wu.ac.th
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Australian Journal of Chemistry 63(1) 75–82 http://dx.doi.org/10.1071/CH09232
Submitted: 20 April 2009
Accepted: 15 July 2009
Published online: 8 January 2010
Abstract
The reaction of ppaX {(4-X-phenyl)-pyridin-2-ylmethylene-amine; X = H, Me, Et, OMe, F, Cl, Br, and I} with [Ni(β-diketonate)2(H2O)2] {β-diketonate = 1,3-diphenylpropanedionate (dbm), 2,2,6,6-tetramethyl-3,5-heptadionate (tmhd), or hexafluoroacetylacetonate (hfac)} yields a series of nickel complexes. X-ray crystallography reveals octahedral coordinated nickel centres with a cis arrangement of the β-diketonate ligands. The β-diketonate ligands adopt ‘planar’ or ‘bent’ coordination modes, whereas the aryl ring of the ppaX ligand is twisted with respect to the pyridylimine unit. The electrochemical behaviour of the complexes reveals quasi-reversible or irreversible one-electron oxidation to Ni(iii) in the case of the [Ni(tmhd)2(ppaX)] and [Ni(dbm)2(ppaX)] complexes, respectively. The peak potential for oxidation is dependent on the type of β-diketonate ligand but essentially independent of the substituent, X, on the ppaX ligand. The [Ni(β-diketonate)2(ppaX)] complexes (X = F, Cl, Br, and I) also undergo ligand based reduction.
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