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

A newly synthesized and dedected stable thiophosphorylradicals, bis(2,6-dim ethylphenoxy)thiophosphoryl and bis(2-tert-butylphenoxy)thiophosphosphoryl and alkyl radical have been observed in gamma irradiated bis(2,6-dimethylph enyl)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 v ery unisotropic varying between 1.9996 and 2.054. Tris(2-iso-propyl-5-methy lphenyl)thiophosphate does not give phosphoryl radical on gamma irradiation . The radical observed is carbon-centered (alkyl) and forms after 1,6-hydro gen shift on isopropyl group towards sulphur atom giving methyl proton spli tting 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.