EPR AND ESEEM STUDIES AN SILVER HYDROXYMETHYL RADICALS IN MOLECULAR-SIEVES

This study focuses on silver hydroxymethyl radicals produced by gamma- ray radiolysis of silver zeolite A and silver molecular sieves, SAPO-4 2, SAPO-5 and SAPO-11 loaded with methanol or ethanol. Electron parama gnetic resonance (EPR) and electron spin echo envelope modulation (ESE EM) spectroscopies have been used to study the structure and dynamics of the silver hydroxymethyl radicals stabilized in these materials. Fr om the magnetic resonance results. it was established that the EPR dou blets with hfs in the range 97-180 G represent covalent Ag . CH(R)OH(R = H, CH3) radicals. The influence of the trapping cage size on the configuration of organosilver radicals is also discussed.