Dual behavior of gold nanoparticles, as generators and scavengers for free radicals
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Literature data available on the interaction of stable free radicals with gold nanoparticles (Au NPs) suggested the adsorption of stable-free radicals on the nanoparticles surface, and the possibility of exchange interaction between the unpaired electron from the free radicals and the conduction-band electrons of the metal [1, 2]. Au NPs, as well as gold salts, are able to catalyze different processes, like oxidation, C–C bond formation, additions, alkylations, etc. [3, 4]. Exchange reactions (the most convenient method to prepare functionalized nanoparticles) mechanism of the ligands involves also in the first step the formation of an organometallic reactive complex [5, 6, 7]. The mechanisms of such processes are still under consideration. Nonetheless, free radicals play a major role in the surface chemistry of metal nanoparticles.
Our previous work demonstrates that Au NPs may abstract a hydrogen or a halogen atom from different substrates, yielding the corresponding short-lived...
KeywordsElectron Paramagnetic Resonance Gold Nanoparticles Nitroxide Diphenylamine Iodobenzene
This work was funded by CNCSIS PN2 ‘Idea’ Grant 158/1.10.2007.
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