Synthesis and Spectroscopic Studies of Copper(II) and Cobalt(II) Complexes with Tetradentate Ligand Derived from Thiophene-2-carbaldehyde

Abstract

The Synthesis of two Tetradentate Schiff base Ligands N2S2 were carried out by the condensation of aldehyde with primary amine. New tetradentate ligands N,N`bis (2-MethylenThiophene)-1,4 phenylene diamine (MTPA) and N,N`bis (2- Methylen Thiophene) ethylenediamine (MTEA) were synthesized from the reaction of thiophene- 2-carbaldehyde  with phenylene 1,4 diamine and ethylene diamine, respectively.The ligands were reacted with Co(II) and Cu(II) metal salts, where the molar ratio of reaction was (1:2) (MTPA:Metal) and (1:1) (MTEA:Metal) molar ratio to form four new coordinated complexes. The mode of bonding and overall geometry of the complexes were determined through elemental analyses, FT-IR, ¹H,¹³C NMR and electronic spectral studies. These studies revealed octahedral geometries for the Co(II) and tetrahedral for Cu(II) complexes with MTPA ligand. While for MTPA complexes with Co(II) and Cu(II) were monomeric octahedral complexes.The structure of the ligands and its metal complexes were elucidated by elemental analyses, IR, ¹H,¹³C NMR, electronic spectra.

Keywords: Tetradentate Ligand , Schiff base, Copper(II) and Cobalt(II) Complexes.