Mechanism of multibubble sonochemiluminescence of Ru(bpy)32+ in neutral aqueous solutions
G L Sharipov1, A M Abdrakhmanov1, L R Yakshembetova1
1Institute of Petrochemistry and Catalysis, Russian Academy of Sciences, Ufa, Russian Federation.
Abstract:
The effect of hydrated electron scavengers, Cd2+, NO3-, (CH3)2CO, and OH radical scavengers, Cl-, I-, on the intensity of Ru(bpy)32+ ion sonochemiluminescence observed in neutral aqueous solutions of Ru(bpy)3Cl2 was studied. The variation trends in the luminescence intensity due to the action of the scavengers indicated three main reactions sufficient to explain the sonochemiluminescence in a neutral medium. These reactions are the Ru(bpy)32+ reduction and oxidation with the H atom and the OH radical, respectively, and disproportionation of the Ru(bpy)3+ and Ru(bpy)33+ ions thus formed, giving rise to the multibubble sonochemiluminescence emitter, namely, the electronically excited ∗Ru(bpy)32 ion.
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