Pulse Radiolysis Studies. X. Electron Transfer Reactions of Aromatic Molecules in Solution

Abstract

Absolute rate constants have been determined by the pulse radiolysis method for the electron transferreaction from a series of aromatic anion radicals in isopropanol solution to a variety of different aromatic molecules: arene a − + arene b = arene a + arene b − . Nine donor—acceptor pairs were investigated in which the donor anion was diphenylide, p‐terphenylide, m‐terphenylide, and o‐terphenylide, and the acceptor molecule was naphthalene, phenanthrene, p‐terphenyl, pyrene, and anthracene. Several, but not all, of the reactions appear to be diffusion controlled with electron transferrate constants ranging from 2.6×108 to 6.4×109 M −1·sec−1 at 25°C.