Abstract
Abstract The proton-transfer reactions of the univalent anions of 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-hydroxy-5-ethyIphenylazo)benzenesulfonic acid (HEB) with hydroxide ion in dioxane-water media, HA−+OH−\oversetkf\undersetkr\ightleftharpoonsA2−+H2O, were studied by means of temperature-jump method. The dependencies of the rate constants, kf and kr on the solvent compositions were interpreted by a mechanism involving the breaking of an intramolecular hydrogen-bond.
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