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Mechanism of the Photofading of Stilbene-fluorescent Dyes. Contribution of Singlet Oxygen to the Photofading of 4,4′-Bisacetamidostilbene

Self-sensitized and Rose Bengal-sensitized photo-oxidation of 4,4′-bisacetamidostilbene (BAAS) in solution gives p-acetamidobenzaldehyde and p-acetamidobenzoic acid via the reaction of singlet oxygen with the trans isomer. The rate of the photo-oxidation is retarded in the presence of effective singlet oxygen quenchers. On the other hand, cis-BAAS is more stable to visible light under the conditions of Rose Bengal-sensitized photo-oxidation than trans-stilbene

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