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.