Synthesis and characterization of nickel(II) and copper(II) complexes with tetradentate Schiff base ligands

Bhowmik, P., Drew, M. G. B. and Chattopadhyay, S. (2011) Synthesis and characterization of nickel(II) and copper(II) complexes with tetradentate Schiff base ligands. Inorganica Chimica Acta, 366 (1). pp. 62-67. ISSN 00201693 doi: 10.1016/j.ica.2010.10.010

Abstract/Summary

The 1:1 condensation of 1,2-diaminopropane and 1-phenylbutane-1,3-dione at high dilution gives a mixture of two positional isomers of terdentate mono-condensed Schiff bases 6-amino-3-methyl-1-phenyl-4-aza-2-hepten-1-one (HAMPAH) and 6-amino-3,5-dimethyl-1-phenyl-4-aza-2-hexen-1-one (HADPAH). The mixture of the terdentate ligands has been used for further condensation with pyridine-2-carboxaldehyde or 2-acetylpyridine to obtain the unsymmetrical tetradentate Schiff base ligands. The tetradentate Schiff bases are then allowed to react with the methanol solution of copper(II) and nickel(II) perchlorate separately. The X-ray diffraction confirms the structures of two of the complexes and shows that the condensation site of the diamine with 1-phenylbutane-1,3-dione is the same.