Journal of the Chemical Society, Dalton Transactions p. 379 - 384 (1992)
Update date:2022-07-30
Topics:
Kwiatkowski, Marek
Bandoli, Giuliano
The condensation fo N-acylated derivatives of o-aminocarbonyl aromatic compounds with the precursor 7-amino-4-methyl-5-azahept-3-en-2-one has been found to depend on the acidity of the amide proton and the nature of the substituent on the carbonyl carbon atom.Three new quadridentate Schiff-base ligands and their nickel(II) complexes having a pendant N-acetyl or N-trifluoroacetyl group have been obtained and characterized by spectroscopic techniques.A very unusual temperature-dependent proton NMR spectrum has been found for <4-methyl-9-(o-trifluoroacetylaminophenyl)-5,8-diazadeca-3,8-dien-2-onato(2-)>nickel(II) indicating a substantial energy barrier for enantiomer interconversion of the chiral complex molecule at moderate temperature.The crystal and molecular structure of this complex has been determined and shows that a fluorine-nickel interaction may be responsible for the inhibited enantiomer interconversion in N-trifluoroacetyl substituted nickel complexes.Crystallographic data: space group P21/c, a = 9.057(2), b = 13.769(4), c = 14.664(4) Angstroem, β = 108.43(2) deg, final R = 0.0434.
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(1992)
