Five co-ordinate complexes of bivalent iron, cobalt, nickel, copper, and zinc halides with terdentate Schiff base and azo-ligands containing tertiary nitrogen donor atoms

Abstract

The ligands N-(β-N′N′-dimethylaminoethyl)pyridinaldimine (paenMe2), N-(2′-N′N′-dimethylaminophenyl)-pyridinaldimine (paphen–NMe2), N-(2′-N″N″-dimethylaminophenyl)-2-N′N′-dimethylaminobenzylideneimine (Me2N–baphen–NMe2) and 2,2′-bis-(NN-dimethylamino)azobenzene (Me2N–ab–NMe2) form complexes with the chlorides or bromides of bivalent iron, cobalt, nickel, copper, and zinc having the general formula MLX2. The stereochemistry of these complexes has been studied by means of magnetic and spectrophotometric measurements. With the exception of Cu(Me2N–baphen–NMe2)Cl2 and Cu(Me2N–ab–NMe2)Cl2, which attain six-co-ordination through chlorine bridging linkages, all are five-co-ordinate complexes.