Abstract
A kinetic treatment describing the time dependence of the exchanged fraction ( F) is presented for the photochemically-induced isotopic exchange process: AX+BX ∗ → hv AX ∗+BX when complicated by a net change in the concentration of AX due to the side reaction: AX → hv BX. The kinetic equations are numerically integrated and applied to the specific case in which AX ≡ iodobenzene and BX ∗ is radioactive iodine (I 131I). The treatment accounts quantitatively for the experimental F vs. time plots. It also leads to the evaluation of the relative rate constants of the phenyl radical (Ph·) scavenging processes: Ph· + I 2→PhI+I. and Ph·+ S→ scavenging products where S is benzene, toluene or molecular oxygen.
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