Abstract
The unsemmetrical Schiff bases salicyladehyde-acetylacetoneethylenediimine (Hsal)(Hacac)en, o-hydroxyacetophenoneacetylacetoneethylenediimine(Hhap)(Hacac)en, o-hydroxybenzophenoneacetyl-acetoneethylenediimine(Hhbp)(Hacac)en, and their nickel(II) and palladium(II) complexes have been synthesized and studied by different techniques. Mass, pmr and double pmr spectra suggest that the free Schiff bases comprise two different hybridized nitrogen atoms. Diamagnetism and spectral data of Ni(II) and Pd(II) chelates are consistent with their square-planar stereochemistry. Pmr spectra indicate that a conjugation between aromatic rings in Ni(hbp)(acac)en and Pb(hbp)(acac)en favours the ketoamine form of the arromatic part of complexes rather than the normal Schiff base struture. Pmr spectrum of Ni(sa)(acac)en studied over the - 70°C, + 30°C range suggests a high flexibility of the five-membered chelate ring.
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