Synthesis and Characterization of Cobalt (II), Nickel (II) and Copper (II) Complexes with Schiff Base Derived from 9,10-phenathrenquinon

Abstract

In this paper, a Schiff base ligand derived from 9,10-phenathrenquinon and 2- aminothiophenol was synthesized in 1:2 molar ratio respectively. The complexes of this ligand with some metal ions such as cobalt (II), nickel (II) and copper (II) were synthesized also. The production of the ligand was carried out by refluxing 9,10-phenathrenquinon with 2- aminothiophenol in the presence of hydrochloric acid as a catalyst for four hours. While the ligand complexes were prepared by reacting the ligand with the mentioned metal ion salts in ethanol in 1:1 L:M ratio to produce the related metal complex. IR spectroscopy, UV-Visible, conductivity measurements, magnetic susceptibility and thermogravimetric analysis techniques were used to characterize the produced compounds. According to the obtained IR spectroscopy results, the coordination between the metal ions and the ligand occurs through the imine group of Schiff base and the thione group of 2- aminothiophenol. Conductance measurements shows the electrolytic nature of the three complexes. While, the magnetic susceptibility measurements were found to be 1.51, 0.0 and 1.48 BM for Co (II), Ni (II) and Cu(II) complexes respectively. By the available results from UV-Visible, conductivity measurements, magnetic susceptibility and thermogravimetric analysis the square planar structure is suggested for the complexes and their suggested general chemical formula is [M(L)] Cl₂. nH₂O.