Contribution of Singlet Oxygen Quencher to the Photofading of Arylazonaphthol Dyes

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  • アリールアゾナフトール系染料の光退色におよぼす一重項酸素クェンチャーの寄与
  • アリールアゾナフトールケイ センリョウ ノ ヒカリ タイショク ニ オヨボス

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"The effect of introduction of singlet oxygen quenching substituent, nickel sulfonate group, to the photofading of 4-arylazo-l-naphthol dyes that undergo direct and sensitized photochemical fading in solution by a singlet oxygen mechanism has been examined on silica gel. The nickel salts of 4-arylazo-l-naphthol-4'-sulfonic acid (7), Orange I, or 2'-sulfonic acid delivative (8) was prepared by (7) or (8) with nickel (II) chloride in water or ethylene glycol. The photofading of (7) and (8) were not inhibited by the addition of Nickel bis toluene sulfonate, singlet oxygen quencher, but the nickel salts of these dyes afforded protection against fading. Especially, the nickel salt of (8) was much stable against fading. It was suggested that the introduction of singlet oxygen quenching substituents, e.g. nickel sulfonate group, in the vicinity of attacked position by singlet oxygen is efficient for the protection of photofading of 4-arylazo-1-naphthol dyes."

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