Generation of 1O2 and the mechanism of internal conversion in 9,10-diphenylanthracene

Laser photolysis techniques have been employed show that the quenching of the excited electronic states of 9,10-di-phenylanthracene involve an energy transfer mechanism resulting in generation of singlet oxygen from both the lowest singlet and triplet states of the hydrocarbon. Internal conversion from the excited singlet of the 9,10-diphenylanthracene is enhanced by oxygen as well. This process is attributed to formation of sterically hindered conformers. The temperature dependence of internal conversion of 9,10-diphenylanthracene was also examined.