A STUDY OF THE PHOTOPHYSICAL AND PHOTOCHEMICAL PROPERTIES OF THE S8MOLECULE The Quenching of Benzene, Naphthalene and Pyrene Fluorescence by S8Molecules in S8+ Liquid Methanol System. I

The energy of the first excited singlet state S1 of S8 is estimated as 89 ± 3 kcal · mole−1. S8 does not exhibit fluorescence, but quenches the fluorescence of certain sensitizers (benzene, naphthalene, pyrene) acting as an energy acceptor in the energy transfer process from the S1 state of the sensitizer. The process of the quenching of donor fluorescence by S8 was analysed using the Stern–Volmer equation.