Inverted region electron transfer demonstrated by electrogenerated chemiluminescence at the liquid/liquid interface

Article Abstract:

Research was conducted to examine several electrogenerated chemiluminescence (ECL) processes occurring at the PhCN/water interface. Hydrophobic radical ion precursors of the emitting species were electrogenerated in the organic solution, while the hydrophilic coreactant was dissolved in the aqueous solution. The observed ECL signal in the systems provides evidence for the Marcus inverted region behavior in very exothermic heterogeneous electron-transfer reactions at the liquid/liquid interface.

Analysis, Oxidation-reduction reaction, Oxidation-reduction reactions, Excited state chemistry

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Hot electron generation in aqueous solution at oxide-covered tantalum electrodes. Reduction of methylpyridinium and electrogenerated chemiluminescence of Ru(bpy)(sub 3)(super 2+)

Article Abstract:

The generation of hot electrons in aqueous solutions at potentials well above those where hydrogen evolution occurs is investigated. Hot electrons are generated electrochemically from thermalized electrons in the metal without forming hot electrons in the oxide and without irradiation. The results show that the N-methylpyridinium ion can be reduced on Ta/Ta(sub 2)O(sub 5) in aq KCl at a potential where hydrogen evolution prevents its reduction on Au or Pt.

Electrochemistry

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