Electron spin resonance studies of the radicals of (Ar′O)2P(S)Cl and (Ar″O)3P=S induced by gamma irradiation: (Ar′=2,6-dimethylphenyl and 2-tert-butylphenyl; Ar″=2-iso-propyl-5-methylphenyl)

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Odabaşoǧlu M., Tapramaz R., Gümrükcüoǧlu I. E.

Phosphorus, Sulfur and Silicon and Related Elements, vol.158, pp.57-66, 2000 (Scopus)

• Publication Type: Article / Article
• Volume: 158
• Publication Date: 2000
• Doi Number: 10.1080/10426500008042073
• Journal Name: Phosphorus, Sulfur and Silicon and Related Elements
• Journal Indexes: Scopus
• Page Numbers: pp.57-66
• Keywords: Carbon-centered radicals, Esr spectroscopy, Phosphate esters, Phosphoryl radicals, Thioarylphosphates
• Ondokuz Mayıs University Affiliated: Yes

Abstract

A newly synthesized and dedected stable thiophosphorylradicals, bis(2,6-dimethylphenoxy)thiophosphoryl and bis(2-tert-butylphenoxy)thiophosphosphoryl and alkyl radical have been observed in gamma irradiated bis(2,6-dimethylphenyl)chlorothiophosphate and bis(2-tert-butylphenyl)chlorothiophosphate and tris(2-iso-propyl-5-ethylphenyl)thiophosphate single crystals respectively. The characteristic feature is that the phosphorus hyperfine splitting are 26.76 G and 26.65 G respectively for two compounds, but the g values are very unisotropic varying between 1.9996 and 2.054. Tris(2-iso-propyl-5-methylphenyl)thiophosphate does not give phosphoryl radical on gamma irradiation. The radical observed is carbon-centered (alkyl) and forms after 1,6-hydrogen shift on isopropyl group towards sulphur atom giving methyl proton splitting with 15.86 G and a proton siplitting in the neighborhood with 5.5 G. The g value is measured to be 2.0025 for this radical.