Electron-transfer and excited-state properties of radiolytically generated transients of acridine(1,8)dione dyes in an organic matrix

Pulse radiolysis technique has been employed to generate and investigate election and energy transfer reactions involving acridine(1,8)dione dyes in hydrocarbons. The transient absorption spectra obtained on pulse radiolysis of N(2)-saturated solution in 1,2-dichloroethane are assigned to solute radical cation. The radical cations undergo charge transfer reaction with tetramethyl-p-phenylenediamine and triethyl amine. The transient absorption spectra in Nz-saturated solution in benzene are assigned to triplet-triplet absorption. It was observed that biphenyl, p-terphenyl and benzophenone triplets undergo energy transfer to methyl and phenyl substituted acridine(1,8)dione dyes generating the triplets of the acceptor. With H substituted acridine(1,8)dione dye, benzophenone and chloranil triplets favor electron-transfer followed by Hf transfer reaction forming benzophenone ketyl and chloranil semiquinone radicals respectively. (C) 2001 Published by Elsevier Science B.V.