✍ Scribed by Günther von Bünau; Susanne Weber; Thomas Wolff
No coin nor oath required. For personal study only.
Anthracene in frozen aqueous micellar solutions of surfactants n-alkyltrimethyl-ammonium halide (C',,TAX, n = 10, 12, 14, 16 and 18; X=F, Cl, Br, I) was exposed to laser pulse excitation at 308 nm in the temperature range HI-270 K. Relative triplet yields and lifetimes were measured by electron paramagnetic resonance (EPR) spectroscopy and found to depend on both temperature and environment. A temperature dependent and a temperature independent process is involved in the decay of the triplet state of anthracene. At least three processes compete with intersystem crossing generating triplets: fluorescence, internal conversion, and a photoreaction assigned to the formation of anthracene/halide exciplexex. The last process is strongly dependent on temperature and indicates significant mobility of reactants below the macroscopic melting point of the solvent.
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