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Issue 10, 2010
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Synthesis and characterisation of bis(β-ketoaminato) complexes of cobalt(ii)

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Abstract

Condensation of 1-phenyl-1,3-butanedione with various substituted anilines affords N-aryl substituted β-ketoamines PhC(O)CHC(CH3)Naryl, which, when deprotonated and reacted with Co(OAc)2·4H2O yields a series of bis(β-ketoaminato)cobalt(II) complexes 1b to 6b (aryl = Ph, 1b; p-CH3C6H4, 2b; 2,6-(CH3)2C6H3, 3b; 3,5-(CH3)2C6H3, 4b; p-CF3C6H4, 5b; p-CH3OC6H4, 6b). All six cobalt compounds were characterised by 1H NMR, elemental analysis, magnetic susceptibility, and X-ray crystallography, indicating a uniform tetrahedral geometry in all cases. Electrochemical oxidation potentials indicate sensitivity to aryl substitution at the ortho- and para- positions, but not to meta-substitution, a conclusion supported by DFT calculations.

Graphical abstract: Synthesis and characterisation of bis(β-ketoaminato) complexes of cobalt(ii)

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Article information


Submitted
21 Oct 2009
Accepted
06 Jan 2010
First published
27 Jan 2010

Dalton Trans., 2010,39, 2573-2578
Article type
Paper

Synthesis and characterisation of bis(β-ketoaminato) complexes of cobalt(II)

K. C. D. Robson, C. D. Phillips, B. O. Patrick and W. S. McNeil, Dalton Trans., 2010, 39, 2573
DOI: 10.1039/B921153E

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