LUMINESCENCE PROPERTIES OF BENZO[F]QUINOLINE ADSORBED ON BETA-CYCLODEXTRIN SODIUM-CHLORIDE AS A FUNCTION OF TEMPERATURE

Fluorescence and phosphorescence quantum yields, fluorescence and phosphorescence polarization values, and phosphorescence lifetimes were obtained for benzo[f]quinoline (B(f)Q) adsorbed on beta-cyclodextrin(beta-CD)/NaCl matrices as a function of temperature from 296 to 93 K. A variety of fundamental luminescence parameters were calculated that were correlated with the interactions of B(f)Q with the beta-CD/NaCl matrices. The phosphorescence quantum yield data revealed that B(f)Q on 30% beta-CD/NaCl at 296 K almost gave the same quantum yield value as at 93 K. In addition, the fluorescence polarization values for B(f)Q showed little change as a function temperature, whereas the phosphorescence polarization values demonstrated a much more dramatic change with temperature. Very long rotational relaxation times were calculated for B(f)Q adsorbed onto 30% beta-CD/NaCl, which indicated that B(f)Q was held very tightly on the beta-CD matrix. Low temperature had very little effect on the luminescence quantum yields for B(f)Q adsorbed on 30% beta-CD/NaCl, which showed that luminescence analysis could be carried out at room temperature with little loss in analytical sensitivity.