Fluorescence and phosphorescence parameters of pyrene, 3-chloropyrene and 3-bromopyrene have been determined as a function of temperature. The effect of the heavy (halogen) atom substitution is shown in the transitions which involve a change of spin multiplicity. The dependence of fluorescence lifetimes of 3-chloropyrene on temperature is analyzed in terms of a double intersystem-crossing.
I. Barradas, J. A. Ferreira and M. F. Thomaz, J. Chem. Soc., Faraday Trans. 2, 1973, 69, 388 DOI: 10.1039/F29736900388
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