Dilute solutions of pyrene in cyclohexane produce a fluorescence spectrum that e

Question

Dilute solutions of pyrene in cyclohexane produce a fluorescence spectrum that exhibits the mirror image relationship between emission and excitation spectra and produces an emission maximum at about 390 nm. As the concentration of pyrene [pyene] is increased the band at 390 nm diminishes and a new emission appears at 480 nm. The intensity of the new emission appears at 480 nm. The intensity of the new band is proportional to [pyrene]^2. Suggest an explanation that will account for these observations.

Explanation / Answer

480 nm peak increase is due to increase in dimer formation.

390 peak decrease is due to relative decrease in monomer abundance.

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