Photolytic and Radiolytic Studies of Ru(bpy)32+ in Micellar Solutions

Dan Meisel*, Max S. Matheson, Joseph Rabani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

Ru(bpy)32+ is shown to form a water-insoluble salt with dodecyl sulfate ions (DS) which is solubilized by sodium dodecyl sulfate (SDS) micelles. In the micelles the rate of the reaction of Ru(bpy)32+ with eaq_ is reduced while its rate of reaction with various metal cations in their reduced form (Zn+, Cd+, Co+) is enhanced. This, as well as the ionic strength effect on these rates, clearly indicates that Ru(bpy)32+ resides in a negatively charged ionic atmosphere. In the presence of.SDS micelles the luminescence from the charge transfer excited state of Ru(bpy)32+ is red shifted as compared to its spectrum in the absence of SDS. Since long-chain alcohols have a similar effect it is concluded that Ru(bpy)32+ must strongly intereact with the hydrocarbon chain of the surfactant. Our kinetic results indicate that essentially all of the Ru(bpy)32+ is bound to the micelles under our experimental conditions. The rates of reaction of the lowest charge transfer excited state of Ru(bpy)32+ in micellar solutions are shown to be faster with Cu2+ ions and slower with Fe(CN)63- ions as compared to the rates of the same reactions in simple aqueous solutions. However, the yield of the redox products of the reaction with Cu2+ that can escape to the bulk of the solution is greatly reduced by the micelles.

Original languageEnglish
Pages (from-to)117-122
Number of pages6
JournalJournal of the American Chemical Society
Volume100
Issue number1
DOIs
StatePublished - 1978
Externally publishedYes

Fingerprint

Dive into the research topics of 'Photolytic and Radiolytic Studies of Ru(bpy)32+ in Micellar Solutions'. Together they form a unique fingerprint.

Cite this