Abstract
AbstractThe pressure and temperature dependencies of the fluorescence quantum yield of 9‐methylanthracene (MA) and 9,10‐dibromoanthracene (DBA) were investigated in heptane and toluene, respectively. The data were interpreted in terms of the Eyring transition state theory. ‐In the case of MA it was found that the activation enthalpy ΔH* of S1 → T2 intersystem crossing increases with increasing pressure, while for DBA no pressure dependence of ΔH* was observed. An increase in the fluorescence quantum yield at higher pressures was found for both compounds and was attributed to a positive activation volume S1 → T2, which inhibits S1 → T2 intersystem crossing.
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