Abstract
Abstract Imidazole-2-carboxaldehyde (IC) reactivity in the presence of halide anions (Cl – , Br – , I – ) has been studied by laser flash photolysis in aqueous solution at room temperature. The absorption spectrum of the triplet state of IC has been measured with a maximum absorption at 330 nm and a weaker absorption band around 650 nm. Iodide anions proved to be efficient quenchers of the triplet state IC, with a rate coefficient k q of (5.33 ± 0.25) × 10 9 M −1 s −1 . Quenching by bromide and chloride anions was less efficient, with k q values of (6.27 ± 0.53) × 10 6 M −1 s −1 and (1.31 ± 0.16) × 10 5 M −1 s −1 , respectively. The halide (X – ) quenches the triplet state; the resulting transient absorption feature matches that of the corresponding radical anion (X 2 – ). We suggest that this type of quenching reactions is a driving force of oxidation reactions in the oceanic surface microlayer (SML) and a source of halogen atoms in the atmosphere.
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