Knowledge Bank

A highly accurate and sophisticated experimental technique has been used in measuring energy transfer from 1,2,4-trimethyl benzene to any of the following compounds: pyrene, 1-naphthylamine, triphenylamine, naphthalene, 4-biphenyl phenyl ether, 9,10-dichloroanthracene, 1,1 biphenyl, phenol, ppo, and popop. The ratios of the relative intrinsic quantum yields of the donor (D) and each of the previously mentioned acceptors (A) have been evaluated using a model that is independent of the concentrations of D or A and any of the standards that are customarily used. These rations of the quantum yields agree quite well with those reported in literature and confirm the validity of the reasoning for using some compounds as standard ones. From the decay time measurements (using a pulsed nanosecond spectral source fluoremetry system) the rate of energy transfer from excited D to A has been calculated for each pair. Other important parameters have been also calculated and will be reported during the symposium.