THE TEMPERATURE-DEPENDENCE OF THE INTERMOLECULAR EXCIMER FORMATION - A STUDY OF THE TIME-RESOLVED FLUORESCENCE BY GLOBAL COMPARTMENTAL ANALYSIS

The excimer formation of 1-pyrenylpentametyldisilane (P2) in isooctane is studied as a function of concentration and temperature. This contr ibution shows for the first time how the global compartmental analysis can be used to determine the temperature dependence of the excited st ate processes of an excimer forming species, i.e. the activation energ y of excimer formation and excimer dissociation, the stabilisation ent halpy of the excimer (DELTAH-degree) and the entropy change of the exc imer formation. The activation energy of excimer formation is found to be larger than the activation energy for viscous flow.