Mechanism of the Ru(bpy)32+ single-bubble sonochemiluminescence in neutral and alkaline aqueous solutions.
In: Journal of Luminescence, Jg. 208 (2019-04-01), S. 99-103
Online
academicJournal
Zugriff:
Abstract The paper addresses sonochemiluminescence generated by a single bubble levitating in neutral and alkaline aqueous solutions of Ru(bpy) 3 Cl 2. Generally, this sonochemiluminescence was found to obey the rules identified previously for multibubble sonochemiluminescence and to be described by reactions between the Ru(bpy) 3 2+ ion and the radical products Н·, ОН·, and e aq in solution. These products arise in the bubble upon decay of low-temperature plasma and migrate to the solution as the bubble intensively moves and its spherical shape is distorted as a result of a change in the acoustic pressure above and below the stability threshold. Some radicals can also get into the solution from a stationary bubble. The difference from the multibubble sonochemiluminescence is that luminescence intensity has a higher contribution of the re-emission effect of bubble luminescence by Ru(bpy) 3 2+ ions. In solutions with low concentrations of the complex (10–6–10–5 М) and the bubble being stationary, this effect provides up to 2/3 of the total ruthenium emission intensity. It is suggested that the hydrated electrons, which increase the yield of sonochemiluminescence, can be generated upon single-bubble sonolysis of neutral solutions rather than only upon conversion of H atoms in alkaline solutions, as is the case for the multibubble sonochemiluminescence. Graphical abstract fx1 [ABSTRACT FROM AUTHOR]
Titel: |
Mechanism of the Ru(bpy)32+ single-bubble sonochemiluminescence in neutral and alkaline aqueous solutions.
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Autor/in / Beteiligte Person: | Gareev, B.M. ; Yakshembetova, L.R. ; Abdrakhmanov, A.M. ; Sharipov, G.L. |
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Zeitschrift: | Journal of Luminescence, Jg. 208 (2019-04-01), S. 99-103 |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 0022-2313 (print) |
DOI: | 10.1016/j.jlumin.2018.12.033 |
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