Abstract
The results of experimental studies of the fluorescence of chemically mixed crystals of anthracene with large acridine concentrations (⩾ 1 mol%) at 4.2 K are reported. Excitation of fluorescence, carried out with excitation energies lower than the energy of the bottom of the singlet excitonic band, has revealed the formation of acridine dimers (resonance pairs) in the case of crystals with 1 mol% concentration of acridine. An aggregation-controlled spacing between nearly degenerate (in an isolated molecule) singlet 1(π, π*) and 1(n, π*) states of acridine is proposed as an explanation of the fluorescence properties of acridine dimers
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