TOTAL LUMINESCENCE SPECTROSCOPY OF TERRYLENE IN LOW-TEMPERATURE SHPOLSKII MATRICES

Fluorescence emission and excitation spectra of terrylene in several n -alkane Shpol'skii matrixes have been studied at liquid helium tempera tures. The presence of two dominant Shpol'skii sites has been detected in all matrixes; we tentatively attribute one of the sites to terryle ne substitutionally entering the host lattice, and the other one to gu est molecules situated in the region of defects. The experiments, supp orted by quantum-chemical calculations, point to the existence of two stereoisomers of the solute. We found n-decane to form the best matrix for terrylene; the system seems to be suitable for single molecule sp ectroscopy studies.