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http://nopr.niscair.res.in/handle/123456789/2147
Title: | Micellar effects on dye sensitized photooxidation of phenothiazine |
Authors: | Kathuria, Shipra Gupta, P K Dhamiwal, N R |
Issue Date: | Sep-2008 |
Publisher: | CSIR |
Abstract: | Methylene blue sensitized photooxidation of phenothiazine (PTH) in sodium dodecylsulphate, 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 λmax indicates the formation of an additional product, which is destroyed during the separation. An inverse relationship between log Φ (Φ= quantum yield of PTN formation) and 1/Є₀ (Є₀ = dielectric constant of the medium) supports the participation of singlet oxygen (¹O₂) at low [PTH]. A mechanism consistent with the results showing the participation of ¹O₂ 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. |
Page(s): | 1384-1388 |
URI: | http://hdl.handle.net/123456789/2147 |
ISSN: | 0376-4710 |
Appears in Collections: | IJC-A Vol.47A(09) [September 2008] |
Files in This Item:
File | Description | Size | Format | |
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IJCA 47A(9) 1384-1388.pdf | 891.1 kB | Adobe PDF | View/Open |
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