Abstract
The sonochemiluminescence in 10−4 M aqueous solutions of Ru(bpy)3Cl2 was studied in the presence of NaOH and KOH (up to 0.4 M). The observed increase in the steady-state emission intensity from Ru(bpy)32+ as compared with the intensity in neutral solutions was attributed to conversion of H resulting from water sonolysis to eaq. As a result, there is a multiple (>106) change in the concentrations of the sonochemical intermediates Ru(bpy)3+ and Ru(bpy)33+. The reduction of the Ru(bpy)33+ ion with H, which is of low efficiency for the formation of the excited *Ru(bpy)32+ ion, is replaced by reduction with hydrated electron, in which *Ru(bpy)32+ is generated in a high yield. The participation of eaq provides a fivefold increase in the sonochemiluminescence intensity in a key disproportionation reaction: Ru(bpy)3+ + Ru(bpy)33+ → Ru(bpy)32+ + *Ru(bpy)32+. It was shown that chemiluminescence from reduction of intermediate Ru(bpy)33+ with the OH− ion does not make a pronounced contribution to the sonochemiluminescence intensity.
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