Synthesis and Characterization of Tetradentate N₂O₂ Schiff Base Ligands and Their Transition Metal Complexes

Abstract

Two new ligands, 1,2‐propylimino‐bis(isonitroso‐2‐acetylnaphthalene) (H₂L¹) and 1,2‐ethyl‐imino‐bis(isonitroso‐2‐acetylnaphthalene) (H₂L²), have been synthesized by the reaction of isonitroso‐2‐acetylnaphthalene with 1,2‐diaminopropane or 1,2‐diamino‐ethane. These ligands were reacted with nickel(II), copper(II), cobalt(II), zinc(II), cadmium(II) and mercury(II) ions to form complexes containing tetradentate Schiff bases. Each metal ion is in a four‐coordinate environment of two imine nitrogen atoms and two oxime oxygen atoms. The new compounds have been characterized by elemental analyses, magnetic susceptibility, mass, IR, ¹H and ¹³C NMR spectroscopy.

Keywords:

• Schiff base complexes
• Schiff base ligands
• transition metal complexes