Free Radicals and Their Interactions in Solid Molecular Mixtures

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Abstract
Solid mixtures of Sephadex and penicillamine, irradiated at 77[degree]K, were studied by ESR [electron spin resonance] technique. Sephadex is a modified dextran containing a network of interstices and pores. The degree of mixing between Sephadex and penicillamine was altered by varying the amount of water in the suspension prior to lyophilization. It was found that the qualitative and quantitative ESR spectra depend strongly on the extent of contact between the 2 components of the mixture. Evidence was obtained that secondary reactions, resulting in transfer of radiation energy from Sephadex to penicillamine, take place at 77 [degree]K. On heat-treatment of the mixtures, irradiated at 77[degree]K, the organo-sulfur radicals R[long dash]C(CH3)2[long dash]S[image] are formed to a much greater extent than if no intermolecular reactions had taken place. The results demonstrate that the formation of S radicals increases with the degree of mixing between the 2 components.

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