Synthesis, spectroscopy of copper(II) catechol complexes

Catechol enzymes are important in many natural systems, being present in plants, insects and crustaceans. The catechol oxidases, for example, act in the catecholase activity, that is, they have the capacity to catalyze oxidation reactions involving the transfer of two electrons from a wide variety of o-diphenols to the respective o-quinones, causing the reduction of oxygen to water1.In addition, these enzymes interact with organic compounds acting as a powerful building block for polymer networks with excellent mechanical properties. Many researches are developed using synthetic tactics so that new paramagnetic ligands with redox activity are obtained. Based on these, it is possible to obtain molecular materials where a paramagnetic metal ion is coordinated to an organic radical.Therefore, in this project, it is proposed the use of 4-tert-Butylcatechol(1), 4-ferrocenyl aniline(2), and copper(II) ions to investigate the kinetic mechanism of the structural organization of these polymeric compounds. the compound [Cu(1)2(2)2] was obtained by solubilization 0.36 mmol (1) and 0.36 mmol (2) in ethanol. After was add 0.12 mmol CuCl2. The mixture is refluxed at 50ºC for 3 hours. The formed black precipitate is filtered, washed with ethanol and dried. The product is recrystallized from ether. Yield: 83 mg (67.8%).IR(KBr, cm-1) : 3553 ( NH), 2959 ( CH3), 1591 ( C-N), 1460 ( C-O), 1263 ( Ar-N), 1004-1106 ( Fc).(Figure 1a) The Mössbauer spectroscopy study shows a characteristic doublet of Fe (II) with an isomeric displacement of 2.32 mm/s, and a quadrupolar unfolding of 0.32 mm/s (Figure 1b). The results obtained are in agreement with the proposed structure.The electrochemical characterization and structural of the compound is underway.