Studies of the Photoreduction of Acridine in Ethanol by the Flash Technique

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Abstract
With the flash technique, the absorption spectra of the triplet state and of the semireduced form of acridine were observed, and the kinetics of the reactions involving these transient species was investigated. It was established that the photoreduction of acridine in the deaerated ethanol solution proceeds via two paths. One is a path via semireduced acridine; this path is strongly inhibited by the presence of oxygen, which efficiently oxidizes semireduced acridine. In the other path, the final product, acridan, is produced immediately after flashing, with no appreciable transient species being formed. The photoreduction by this path is not affected by the presence of oxygen. It may be presumed that this process is a molecular one between singlet acridine and alcohol. The reactive species in the former path also seems to be the singlet excited state instead of the lowest triplet state.

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