Abstract
As a new series of compounds designed for organic light-emitting diodes and organic photovoltaics, dihydro-indenoindenes (DI) substituted by bis(diarylamino) groups (R-DI) including bis(diphenylamino)dihydro-indenoindene, bis(ditolylamino)dihydro-indenoindene, and bis(carbazolyl)dihydro-indenoindene were studied during the pulse radiolysis in solvents to measure the transient absorptions of the corresponding radical cations (R-DI•+), radical anions (R-DI•–), and R-DI in the triplet excited states (3R-DI*). It was clearly indicated that the origin of the electronic transitions in the visible region of DI•+, DI•–, and 3DI* is mainly attributed to the trans-stilbene skeleton of DI. With increasing the electron-donating ability of the diarylamino substituents, the absorption peaks of R-DI•+, R-DI•–, and 3R-DI* showed a red shift. The observed spectra and theoretical calculations suggested that the positive charge is mainly localized on the triphenylamine moiety of R-DI•+, whereas the negative charge is locali...
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