Redox Reactions of Thallium Clusters in Aqueous Solution

Abstract

AbstractThe redox chemistry of thallium clusters in aqueous solution has been investigated by pulse radiolysis and γ‐radiolysis. Using Ru(bpy)32+ as a redox indicator, it is shown that the redox potential of the Tl42+/+ couple is more positive than −1.27 V NHE, and that the Tl+/Tl2+ couple's redox potential is more negative than −1.27 V NHE. Ru(bpy)3+ reduces Tl42+ with a second‐order rate constant of 6±2 × 108 M−1s−1. Metallic particles of thallium are predicted to have a surface plasmon absorption band at 205 nm in water. The reduced Tl content in a sol can be measured by air‐free titration with CCl4 or methylviologen.