Spectroscopic and theoretical study of aromatic a-hydroxy hydrazones and their copper(II) complexes in dioxane–water mixtures

LEDESMA, G. N.; GONZALEZ SIERRA, M.; ESCANDAR, G. M.

POLYHEDRON

Elsevier Science Ltd

Lugar: Amsterdam; Año: 1998 vol. 17 p. 1517 - 1523

0277-5387

Two aromatic a-hydroxy hydrazones, N-phenyl-N’(2-hydroxy-1-phenylmethylene hydrazine) and N-phenyl-N’(2-hydroxy-1-naphthylmethylene hydrazine), and their copper(II) complexes have been studied in both 30% and 70% dioxane-water (v/v) systems. Structural analysis of the anionic forms of the free compounds has been performed using 13C NMR and electronic absorptionspectroscopies and semiempirical MO calculations. The equilibrium constants for the deprotonation reactions of the hydrazones and for their coordination with Cu(II) ion were studied by spectrophotometric titration. Coordination binding sites and stereochemistry of the chelates were inferred from NMR spectroscopy.