Abstract
Stable pyrene, perylene, anthracene and N,N-tetramethyl phenylenediamine (TMPD) cation radicals are produced thermally or photolytically on laponite clay. The photoproduced ions are stable for hours under vacuum, but eventually recombine to reinstate the arene. The TMPD cation radical is produced mainly through a thermal channel which is unaffected by the presence of oxygen. The other cation radicals are also produced thermally but the yields are greatly increased by exposure to UV light (300 nm) under vacuum. Oxygenated samples exposed to UV radiation produce cation radicals and unknown colored products. The luminescence of pyrene, perylene and TMPD cation radicals on laponite are also reported. Time resolved pulsed laser diffuse reflectance studies show no trace of any trapped electron species within the 400–800 nm spectral range.
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