Synthesis and characterization of copper complexes: Interaction of metallic carboxylates with 1,3-thiazole ligand

Abstract

ABSTRACT Complexes were synthesized from aspirinate of Cu(II) and acetate of Cu(II) dihydrated with the ligand 1,3-thiazole and were characterized through elemental analysis, magnetic moment, FT-IR spectroscopy, and thermogravimetric analysis. Moreover, semiempirical structural PM6 of both compounds were carried out. Ligand 1,3-thiazole coordinates with the Cu(II) ions through the nitrogen without break the dimeric unit Cu2 (RCOO)4. To coordinate with the aspirinate of Cu(II), the ligand must to break tridimensional arrangement and to coordinate with the acetate of Cu(II) dihydrated, it replaced the water molecules. In both compounds, Cu2(asp)4(Tz)2 and Cu2(acetate)4(Tz)2, the PM6 calculations corresponding to the Cu-Cu distances in the dimeric unit Cu2 (RCOO)4 presents a small difference 0.03A, but the magnetic moments are very different. The complex with aspirinate presents a magnetic moment of 1.79 M.B and that with acetate is 1.4 MB.