Abstract
Mixed-phase systems were designed by condensing hydrocarbons and halocarbons into the 30 Å pores of the silica tube material, MCM-41. Radical cation probes, generated radiolytically at the phase interface with the silica wall or in the occluded phase inside the mesopores, were detected, as well as their paramagnetic reaction products, by variable-temperature EPR. Chemistry of radical cations at the phase interface and in such confined phases reveals the effects of energy transfer to solvent and geometric constraints on molecular packing and mobility. New, ordered forms of mesoporous silica offer many possibilities for studying the effects of nanoscale heterogeneity on radiation chemistry and on chemistry in general.
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