V.L. Ivanov, S.Yu. Lyashkevich
High Energy Chemistry, v.34 (5), p. 304-308 (2000), translated from Russ. Khimia Vysokikh Energii, v.34 (5), p. 354-358 (2000)
ABSTRACT. It was found that various organic compounds and inorganic salts added in small concentrations to aqueous solutions increase the quantum yields of photochemical chain ion- radical substitution reactions of a halogen by sulpho group in halogenated naphthylamine (4- chloro-1-naphthylamine) and hydroxynaphthalenes (1-bromo-2-hydroxynaphthalene and 4- chloro-2-hydroxynaphthalene). An increase in the quantum yield of the photosubstitution chain reaction of halogen by sulpho group in the aromatic ring in the presence of low concentrations of organic compounds and inorganic salts is a phenomenon common for various substrates in both direct and sensitized photolysis. Neither organic compounds nor inorganic salts in low concentrations affect the fluorescence of substrates and the chain length of the substitution reaction. It is suggested that the main effect of small additives on the photochemical chain reaction is due to a change in the reactivity of ion-radical pairs, forming as the primary products of photoinduced electron transfer reaction at the initiation step.