Metallic Interaction Effects on the Reactivity of Lawsone Semiquinones

An electrochemical analysis of the reduction processes of the associated anion of Lawsone (Lw-) with different metallic ions proves that, no only the energetics of the electron transfer processes are different, but also the stability of the electrogenerated intermediates. This provokes a change in t...

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Bibliographic Details
Main Authors: Frontana, Carlos E., Valle, Grettel, Ugalde-Saldívar, Víctor Manuel, González, Ignacio
Format: Conference Proceeding
Language:English
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Summary:An electrochemical analysis of the reduction processes of the associated anion of Lawsone (Lw-) with different metallic ions proves that, no only the energetics of the electron transfer processes are different, but also the stability of the electrogenerated intermediates. This provokes a change in the reduction mechanism occurring for the studied MLw2Py2 complexes at the first reduction signal, where the reduction of the associated Lw- and the Py species occur. The corresponding radical anions are only detectable for the ZnLw2Py2 complex, as the metallic ion lacks of free electrons capable to couple with the unpaired spins of both radical species. However, this does not seem to affect the properties of the second reduction process observed for this type of compounds, where the reduction of the free conjugated base occurs, generaring a stable radical dianion. The origin of this free anion is still under investigations, but the obtained results show some insights on how does metal-lawsone complexation can modify the solution reactivity and stability of the electrogenerated radical anions.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.2753294