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 [pyrene] 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

This is due to formation of excimer. Excimer nothing but excited state dimer when concentration increase the monomeric state of pyrene will decrease and excimer gorms that is evident from emission spectra that will give an red shifted spectum. When concentration increase excimer forms thats why the intensity of directly proportional to squere of the pyrene concentration.

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