Synthesis, characterization, thermal stability, electrochemical behavior, and antioxidant activity of new oxovanadium(iv) and iron(ii) tetradentate Schiff base complexes

Two new tetradentate oxovanadium(IV) and iron(II) Schiff base complexes have been prepared by the interaction of vanadyl(IV) iron(III) acetylacetonate with ligand obtained from reaction ethylenediamine 5?-(N-methyl-N-phenylaminomethyl)-2?-hydroxyacetophenone in methanol. These characterized means different spectroscopic techniques such as UV–visible, FT-IR, mass spectrometry, elemental analysis. In addition, thermogravimetric (TG) differential thermogavemetric analysis (DTG) utilized to investigate thermal stability these complexes. Results showed that both decompose five consecutive stages, a mechanism has proposed for each stage decomposition. Thermogravimetric carried out using four heating rates 5, 10, 15, 20 °C min?1, kinetic parameters calculated Kissinger method. Cyclic voltammetry employed examine electrochemical behavior two synthesized dimethyl sulfoxide (DMSO) at glassy carbon electrode. Each displayed one quasi-reversible single electron transfer peak near 0.255 V vs. saturated calomel electrode (SCE) V(V)–V(IV) couple ?0.690 SCE Fe(III)–Fe(II) redox couples, respectively. Finally, antioxidant activity newly investigated 2,2-diphenyl-1-picrylhydrazyle (DPPH) free radical scavenging assay. revealed oxovanadium complex exhibits good activity.