Full text
| |
| Author(s): |
Marcos Oliveira Damasceno
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2001-10-30 |
| Examining board members: |
Ana Maria da Costa Ferreira;
Luiz Antonio Andrade de Oliveira;
Henrique Eisi Toma
|
| Advisor: | Ana Maria da Costa Ferreira |
| Abstract | |
New dinuclear copper(II) complexes involving hydroxylated diimine ligands, macrocyclic and macroacyclic, were prepared, with the aim of comparing their structural features. One mononuclear species with simple holder ligand was too isolated. Different techniques were used in characterization of these complexes: UV/Vis, IR and EPR spectroscopies, conductimetry, elemental analyses and magnetic proprieties). The catalytic activity these complexes towards of substrate oxidation, such as 2,6-di-tert-butylphenol e 3,4-di-hydroxyphenylalanina (L-Dopa), by molecular oxygen was verified, showing in general are goods as mimetics of the tyrosinases proteins, copper depends, presenting phenolase and catecholase activity. Complexes with macrocyclic ligands showed more efficient as catalysts than another dinuclear compounds, with macroacyclic ligands. The growth of correspondent quinone was spectrophotometrically monitored and the velocity law established show a pseudo-first order dependence in relation the substrate and complex concentration. The results obtained indicate that structural characteristics these complexes (kind of ligands, hindrance factor and geometric aspects) are determiner of the their activity as catalyst in oxidation reaction. (AU) | |