Unsymmetrical ligand complexes of CuII, NiII, and CoII derived from salicylaldehyde and 1,3-propanediamine with either pyridine-2-carbaldehyde or pyrrole-2-carbaldehyde

Abstract

The 1 : 1 : 1 condensates of salicylaldehyde, propanediamine, and either pyrrole-2-carbaldehyde (L¹) or pyridine-2-carbaldehyde (L²) have been isolated and combined with selected first-row transition-metal ions. The copper(II) and nickel(II) complexes of L¹ have been prepared and characterized, as has the pyridine adduct of the corresponding cobalt(II) derivative. The copper(II) and nickel(II) complexes of L² have also been characterized. Spectral and chemical properties of these systems are compared with those of complexes involving analogous symmetrical Schiff-base ligands.