Propriétés de coordination de deux nouvelles bases de Schiff phénoxy-carboxylates, synthèse, propriétés magnétiques et étude comparative de leur activité antioxydante.

Abstract

This work is part of the spectroscopic and structural characterization by X-ray diffraction as well as the study of the magnetic and biological properties of new 3d and 4d transition metal complexes supported by two tridentate Schiff bases derived from the 3- amino-4-hydroxy benzoic acid, the two ligands are obtained by the reaction of 3-amino-4- hydroxy benzoic acid with either acetylacetone (H3L1) or salicylaldehyde (H3L2). In order to study the effect of the architecture of the two ligands and more precisely the influence of the three hydroxyl, amino and carbonyl groups on the mode of coordination, on the supramolecular stacking and on the biological properties, several ways have been explored and led to some interesting results. The ligands and their complexes have been the subject of detailed structural study. The study of the biological properties revealed that the ligands and their complexes showed interesting antioxidant properties comparable and even better to those of the standards. The study of the magnetic properties on the copper coordination polymer revealed that it exhibits alternating ferromagnetic and antiferromagnetic interactions with the coupling constants: J1 = -0.22 (Cu1… Cu2); J2 = 11.2 (1) cm-1 (Cu1… Cu1), g = 2.29.