Conjugated tetracarbonyl Ligands and their metal complexes

Abstract

The Claisen-Schmidt condensation between β-dicarbonyl compounds (benzoylacetone and acetoacetanilide) and terephthalaldehyde under specified conditions yielded a new series of conjugated tetracarbonyl compounds. Their existence in the intramolecularly hydrogen-bonded enol form (H2L) is confirmed from their IR, 1H NMR and mass spectral data. Dibasic tetradentate coordination of the compounds in their [Co2 (L)2 (H2O)4 ], [Ni2 (L)2 ] and [Cu2 (L)2 ] complexes is established based on analytical and spectral data.