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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Micellar effects on dye sensitized photooxidation of phenothiazine
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Micellar effects on dye sensitized photooxidation of phenothiazine

机译:胶束对吩噻嗪的染料敏化光氧化作用

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摘要

Methylene blue sensitized photooxidation of phenothiazine(PTH)in sodium dodecylsulphatc,cetyl trimethylammonium bromide and brij-35 in methanol-water,ethanol-water and acetonitrile-water gives phenothiazine-3-one(PTN)and phenothiazine sulphoxide as the products at low conversion.A small shift in the lambda_(max)indicates the formation of an additional product,which is destroyed during the separation.An inverse relationship between log PHI(PHI=quantum yield of PTN formation)and 1/C0(C0=dielectric constant of the medium)supports the participation of singlet oxygen(~1O_2)at low[PTH].A mechanism consistent with the results showing the participation of ~1O_2 at low[PTH]and electron transfer-exciplex formation at high[PTH]is postulated.The formation of phenothiazine sulphoxide has been suggested to be through the phenothiazinyl radical.
机译:在甲基-水,乙醇-水和乙腈-水中的十二烷基硫酸钠,十六烷基三甲基溴化铵和brij-35中的吩噻嗪(PTH)的亚甲基蓝敏化光氧化得到低转化率的产物吩噻嗪-3-one(PTN)和吩噻嗪亚砜lambda_(max)的微小变化表明形成了另一种产物,该产物在分离过程中被破坏了.log PHI(PHI = PTN形成的量子产率)与1 / C0(C0 =介电常数)的反比关系。介质支持了低[PTH]时单线态氧(〜1O_2)的参与。推测了一种与结果一致的机制,该结果表明低[PTH]时〜1O_2的参与和高[PTH]时电子转移复合物的形成。已建议通过吩噻嗪基自由基形成吩噻嗪亚砜。

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