Electrochemistry in liquid sulfur dioxide. 12. Electrochemical and pulse radiolysis studies on oxidation of tris(2,2'-bipyridine)zinc(2+), tris(2,2'-bipyridine)cadmium(2+) and 2,2'-bipyridine

Abstract

The electrochemical oxidation of Zn(bpy) 3 2+ , Cd(bpy) 3 2+ , and 2,2'-bipyridine (bpy) in liquid sulfur dioxide was studied by cyclic voltammetry (CV) and spectroelectrochemical techniques. Both Zn(bpy) 3 2+ and Cd(bpy) 3 2+ are oxidize in three closely spaced one-electron reversible steps. The standard potentials for these processes referenced vs the ferrocenium/ferrocene couple are an follows: Zn, 2.33 (E o 3/2 ), 2.43 (E o 4/3 ), and 2.52 V (E o 5/4 ); Cd, 2.31 (E o 3/2 ), 2.39 (E o 4/3 ), and 2.47 V (E o 5/4 )