Pyrene Dimers


THE striking change in the fluorescence spectrum from pyrene in benzene as a function of the pyrene concentration was studied by Förster and Kasper1. They concluded that the violet emission is produced by monomolecular pyrene while the blue emission is from transient dimers. Schmillen2 has observed similar changes in the fluorescence spectrum from pyrene in solid hydrocarbons and has reported decay times of 8.9–9.9 nsec. for monomolecular pyrene and approximately 89 nsec. for pyrene complexes. The true value of the lifetime of pyrene dimers in liquid solutions has recently been the subject of discussion3,4. This communication reports the results of studies of changes in the fluorescence lifetime and in the emission spectrum of pyrene in paraxylene and in cyclohexane for various concentrations of pyrene.

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  1. 1

    Förster, Th., and Kasper, K., Z. Elektrochem., 59, 977 (1955).

  2. 2

    Schmillen, A., Naturforsch., 16, a, 5 (1961).

  3. 3

    Stevens, B., and Hutton, E., Nature, 186, 1045 (1960).

  4. 4

    Parker, C. A., and Hatchard, C. G., Nature, 190, 165 (1961).

  5. 5

    Dorland's Illustrated Medical Dictionary (W. B. Saunders Co., 1960).

  6. 6

    Berlman, I. B., J. Chem. Phys., 33, 1124 (1960).

  7. 7

    Cohen, S. G., and Weinreb, A., Proc. Phys. Soc., B69, 593 (1960).

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BERLMAN, I. Pyrene Dimers. Nature 191, 594–595 (1961).

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