A comparison of charge-transfer mechanisms at rotated disk electrode for biomimetic binuclear and tetranuclear oxo-manganese complex in aqueous solution

作者：Martin Cibely S; Teixeira Marcos F S^*

来源：Inorganica Chimica Acta, 2015, 425: 76-82.

DOI：10.1016/j.ica.2014.10.009

• Biomimetic
• Oxo-manganese complexes
• Rotating disk electrode
• Change transfer mechanism
• Tafel behavior

Many high-valence multinuclear mu-oxo-bridged manganese complexes have been synthesized to mimic the active site of the natural enzymes. The electrochemical and kinetic parameters were determined for two mimicking complexes ([(Mn2O2)-O-IV(terpy)(2)(H2O)(2)](4+) and [(Mn4O5)-O-IV(terpy)(4)(H2O)(2)](6+)) by cyclic voltammetry and linear sweep voltammetry using a rotating disk electrode (RDE). Stability and kinetic behavior are directly related to mu-oxo bridges, where the mu-oxo-bridge provides a fast electron transition between metal centers due to stabilization of dx(2) - y(2) orbitals by the oxygen bond. On the other hand, when the dx(2) - y(2) orbitals are stabilized by aqua ligands by a coordination bond, a displacement of oxidation potential to more positive potential was observed. A shift of the potential to more negative values with increase in rotation rate was observed, which can be ascribed to a chemical step. The chemical step involves the dimerization process of the binuclear oxo-manganese complex to tetranuclear oxo-manganeses complex.

• 出版日期2015-1-30