Synthesis of Co(ІІ) and Cu(ІI) Complexes with NO and N2O2 Ligands derived from Salicylaldehyde

Abstract

Salicylaldehyde has been reacted with aniline and 1,2 phenylendiamine to give the NO and N₂O₂ Schiff Base type ligands named 2-[(pheneylimino) methyl] phenol (LH) and N,N'-bis( salicylidene)-1,2-phenylenediamine (L''H₂). The structures of the ligands were elucidated by FT-IR, ¹H-NMR, ¹³C-NMR and UV-Vis electronic spectra. The coordination behavior of the (LH) and (L''H₂) towards Cu(II) and Co(II) ions has been investigated The reaction of the Schiff base ligands (LH), (L''H₂) with cobalt (II) and copper (II) ions in 1:1 molar ratio afforded mononuclear metal complexes. Whereas, the reaction of the Schiff base ligand (L''H₂) with cobalt (II) and copper (II) ions in 1:2 molar ratio gave binuclear metal complexes. The changes in the selected vibration bands in FT-IR indicate that Schiff bases behave as (NO) bidentate and N₂O₂ tetradentate ligands and coordinate to metal ions from phenolic oxygen atoms and azomethine nitrogen atoms. Characterization and structure elucidation of the prepared complexes were achieved by FT-IR, UV-Vis electronic spectra. The metal complexes exhibited different geometrical arrangements such as square planner, tetrahedral and octahedral arrangements.

Keywords: Salicylaldehyde, Schiff base, mononuclear and binuclear complexes, bidentate and tetradentate ligands