Síntese e caracterização de complexos de Zn(II), Cd(II) E Hg(II) com ligantes ácido piridina-2,6-dicarboxílico e tioureia ou trifenilfosfina

Abstract

In the present work the synthesis and characterization of complexes with ligands: pyridine-2,6-dicarboxylic acid (H2L) and thiourea (TU) or triphenylphosphine (PPh3) are described. The complexes formed have the formula: [Zn(L)(TU)3] (1), [Cd(L)(TU)2] (2), [Hg(L)(TU)2] (3), [Zn(L)(PPh3)3] (4) and [Cd(L)(PPh3)3] (5). The complexes were analyzed by means of infrared spectroscopy (IR), ultraviolet-visible spectroscopy (UV-Vis) (for 1 and 3), simultaneous thermogravimetric differential scanning calorimetry (TG-DSC) (for 1 and 2). A comparative study of analogous complexes of the literature in relation to structures and characterizations was carried out. Thus, the coordination properties of H2L, TU and PPh3 ligands and their respective metal complexes are discussed toward the group 12 metal ions: Zn2+, Cd2+ and Hg2+.