Reactions of the Triplet States of Some Aromatic Compounds

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Abstract
By means of flash photolysis, studies were made on the triplet states of anthracene, naphthacene, coronene, and rubrene dissolved in hexane at temperatures ranging from 20° to —30°C. When the concentration of triplet substances is small, the decay appears to follow first order; under these circumstances, the temperature dependence is small for anthracene and naphthacene (activation energy: 0.2–0.8 kcal/mole). The quenching of the triplet states by added reactants (CCl4, CHCl3, and NO) was studied, and bimolecular rate constants were calculated. Activation energies of the reaction between anthracene and carbon tetrachloride and of other triplet deactivation processes are ∼2.5 kcal/mole; the rate constants themselves are of the order of 104 moles liter—1 sec—1.