Effects of poly(vinyl sulfate) on the decay of excited tris(2,2′-bipyridine)ruthenium(II) in aqueous solutions followed by the pulsed laser technique

Steven Kelder, Joseph Rabani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Both the emission of the so-called "triplet" of Ru(bpy)32+, 3CT Ru(bpy)32+, at 600 nm and the bleaching of its ground state at 480 nm were followed by pulsed laser techniques. The effect of addition of poly(vinyl sulfate) (PVS) was investigated. Three decay reactions of 3CT Ru(bpy)32+ were observed: a fast process with a half-life of the order of 10-8 s accounted for the decay of a significant fraction of the 3CT Ru(bpy)32+. This was followed by a mixed first and second-order decay of the 3CT Ru(bpy)32+ which remained after the end of the fast process. The results are discussed in terms of a triplet-triplet annihilation reaction which occurs due to the concentration effect by the polyelectrolyte. When less than four 3CT Ru(bpy)32+ ions are present, on the average, in each polymer molecule, the only reaction observed is the "natural" decay of 3CT Ru(bpy)32+, with a rate equal to that observed in the absence of PVS.

Original languageEnglish
Pages (from-to)1637-1640
Number of pages4
JournalJournal of Physical Chemistry
Volume85
Issue number12
DOIs
StatePublished - 1981

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