TRIPLET-TRIPLET ABSORPTION OF NAPHTHALIMIDE DERIVATIVES IN ETHANOLIC SOLUTIONS

The spectral and kinetic characteristics of induced triplet-triplet (T -T) absorption for some naphthalimide derivatives in ethanolic solutio ns at room temperature were studied using a laser photolysis technique (lambda(exc) = 347 nm, DELTAt = 20 ns). Investigations in the region of 460 - 700 nm showed that all of these compounds exhibit T-T absorpt ion with the maximum at about 530 - 600 nm. The T-T absorption of naph thalimides decays within (1.2 - 1.6) x 10(-6) s, thus indicating a rel atively low rate for oxygen quenching of triplet states of these compo unds.