THE SPHOLSKII FLUORESCENCE-SPECTRUM OF CYCLOPENTA[C,D]PYRERME - NOVELEVIDENCE FOR ANOMALOUS S-2-EMISSION

The high resolution Sphol'skii fluorescence spectrum of the non-altern ant polycyclic aromatic hydrocarbon cyclopenta[c,d]pyrene (CPP, 1) in an n-hexane matrix at cryogenic temperature is reported. Two distinct narrow spectral lines at 378.0 and 379.6 nm representing two sites wer e found, whereas in n-octane no Sphol'skii effect was observed. In acc ordance with reported data on the fluorescence of CPP (1) these lines have to be assigned to anomalous S-2-emission. (C) 1998 Elsevier Scien ce B.V. All rights reserved.