Abstract
Reaction of polychlorophenols with photophysically generated singlet oxygen was carried out in solvents of different polarity. Rate constants for total removal of singlet oxygen go from 5 × 107 M–1 s–1 in benzene‐methanol mixtures to 2 × 109 M–1 s–1 in water. From substituent and solvent effects it can be concluded that a charge transfer mechanism operates in the photo‐oxygenation. Although physical quenching of singlet oxygen is the main deactivating process, chemical reaction constitutes a considerable contribution. A detailed kinetic study was made, and from the data, photo‐oxidation via singlet oxygen of industrial wastes containing polychlorophenols, appears as a reliable possibility.
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