Photochemistry of tetrachlorosalicylanilide and its relevance to the persistent light reactor

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Abstract
The photochemistry of 3,5,3′,4′‐tetrachlorosalicylanilide has been studied in solution under carefully controlled conditions. When irradiated in a buffered solution of pH 7.4 (physiological pH), three atoms of chlorine are liberated from the molecule instead of one as suggested by earlier photochemical work. From this observation a mechanism is proposed to explain the long‐term photobiological effect of this compound in skin i.e. that of the persistent light reactor.