Fluorescence lifetime decay study of 2,3,6,7-tetrahydro-1H,5H,11H-1 benzopyrano6,7,8-ij-quinoliz-11-one molecule: As a function of solvent viscosity and temperature

摘要

The rotational reorientational time of 2,3,6,7-tetrahydro-1H,5H,11H-[1] benzopyrano[6,7,8-ij]-quinoliz-11-one is studied as a function of solvent viscosity by varying temperature. Using fluorescence depolarization and single photon counting technique. Rotational reorientation times is higher in octanol when compared with ethanol solvent. Mechanical frictions theories SED, GW and DKS were used to determine mechanical friction contribution. Mechanical frictions models fail to describe observed experimental rotational reorientation values.