Investigations of transients produced on reactions of OH radicals with azobenzene in aqueous solutions

Abstract

The OH radicals are observed to react with azobenzene with a bimolecular rate constant of 2.0 x 10¹⁰dm³ mol^-1 s^-1. About 40% of (OH radicals add to benzene ring producing a transient band with λ_m_ax= 330nm and ~ 60% add to - N = N - double bond forming a transient band with <strong>λ</strong>_max = 420 (ε = 10,270 dm³ mol^-1 cm^-1). The OH radicals fail to undergo one electron transfer reaction with azobenzene. Steady state gamma-radiolysis shows the formation of a product absorbing in the 260-280 nm region.