Effect of Sodium Dodecyl Sulfate Concentration on Photooxidation of Methyl Orange Sensitized by Tetraphenylporphyrin

• Published in: Chemical & pharmaceutical bulletin Vol. 36; no. 1; pp. 1 - 7
• Main Authors: NAKAGAKI, MASAYUKI, INOUE, KAZUHIRO, KOMATSU, HIROAKI, HANDA, TETSUROU, MIYAJIMA, KOICHIRO
• Format: Journal Article
• Language: English
• Published: Tokyo The Pharmaceutical Society of Japan 01.01.1988; 公益社団法人日本薬学会; Maruzen; Japan Science and Technology Agency
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; methyl orange; micellar environment; micellar solution; Photochemistry; photooxidation; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); singlet oxygen; sodium dodecyl sulfate; tetraphenylporphyrin; Monoazo dye; Oxygen; Singlet state; Sulfonate; Anionic surfactant; Micellar critical concentration; Aminoazo dye; Benzenic compound; Oxidation; Kinetics; Rate constant; Micellar solution; Photosensitizer; Acetone
• ISSN: 0009-2363; 1347-5223
• DOI: 10.1248/cpb.36.1

The effect of sodium dodecyl sulfale (SDS) concentration on the efficiency of the photooxidation of Methyl Orange sensitized by tetraphenylporphyrin (TPP) in the surfactant solution was investigated. It was found that the efficiency of the photooxidation is lower above the critical micelle concentration of SDS-TPP mixed solution (cmcmix) than below the cmc. By taking into consideration the formation of an oligomer complex between one TPP molecule and several SDS molecules below the cmc, it was possible to explain the relatively lower efficiency above the cmc in terms of the lower reactivity between singlet oxygen produced by the excited TPP and methyl orange (MO) in the less polar environment on the micellar surface.