Síntese e caracterização de complexos de Cobalto (II), Níquel (II) e Cobre (II) derivados dos ligantes 2-Furanocarboxaldeído oxima e 2-Tiofenocarboxaldeído oxima

Abstract

The coordination chemistry of oximes is an increasing area of research, whose efforts are directed especially to their unusual reactivity and complexes. The interest in complexes containing oximes has seizing considerably the researchers’ attention throughout the years due to their wide application for example as anti-inflammatory properties, herbicide, insecticide, or as analytical reagents which can determine the transition metals. Oximes are organic compounds whose general formula is RR'C = NOH, in which R grouping is an organic substituent and R' may be a hydrogen or any other organic group. They may also be organic compounds formed by the condensation reaction of a primary amine to an aldehyde or a ketone. Oximes and oximate group contain two atoms of coordination: the nitrogen atom of the oxime and the oxygen atom of the hydroxyl, deprotonated or not. Thus they can bind to a metal in several coordination modes and can also form bonds of either intra or intermolecular hydrogen. This remarkable ability of oximate group to form bonds between the metallic ions resulting polynuclear complexes with different types of binding has been used as a new strategy for the synthesis of homo and hetero metallic complexes. Proceeding the works that had already been developed by this research group in the field of synthesis of complexes derived from Schiff Bases, the present study reports the results obtained in the synthesis and characterization of complexes derived from the ligands 2-furanocarboxaldehyde and 2-thiophenecarboxaldehyde oximes. The metals chosen for the synthesis of the complexes were: cobalt (II), nickel (II) and copper (II). The ligand and obtained complexes were characterized by infrared (FTIR) and ultraviolet-visible (UV- VIS) spectroscopies and X-ray diffraction powder analysis (XRD). The ligand was characterized via gas chromatography coupled with mass detector GC/MS.