Formation and Stabilization of Free Radicals in Mixed-Crystal Structures of Dicarboxylic and Peroxydicarboxylic Acids
American Chemical Society
Journal of the American Chemical Society
A new phenomenon is described-the formation of free radicals from peroxydicarboxylic acids (peroxydisuccinic and peroxydiglutaric) on their cocrystallization with dicarboxylic acids (succinic, glutaric, and fumaric acids) in the absence of any external action on the matrix. The free-radical species were detected by ESR. The steady-state concentration of the radicals depends on the molar ratio of peroxydicarboxylic acid/dicarboxylic acid, the maximum concentration being ca. 6 X 1 01* radicals/g. Free radicals stabilized in dicarboxylic acid matrices could be stored as radical-containing samples for several months at ambient temperature. X-ray studies of the mixed peroxydicarboxylic acid-dicarboxylic acid crystals clearly point to the importance of the structural resemblance between the components as the main factor responsible for the formation of the free-radical species
Nikishin, Gennady I.; Koritzky, A. T.; Lindeman, Sergey; Gerr, R. G.; Struchkov, Yu T.; and Starostin, E. K., "Formation and Stabilization of Free Radicals in Mixed-Crystal Structures of Dicarboxylic and Peroxydicarboxylic Acids" (1989). Chemistry Faculty Research and Publications. 725.