Photooxygenation of singlet oxygen traps upon excitation of molecular oxygen by dark red laser radiation in air-saturated solutions

摘要

The photooxygenation of tetracene and 1,3-diphenylisobenzofuran was shown to occur in air-saturated carbon tetrachloride upon laser irradiation at 765 nm. The action spectrum of the photoreaction is represented by the narrow band with the halfwidth less than or equal to 20 nm and the maximum at 765 nm. The data indicate that photoreaction is due to direct laser excitation of the 1Σg +(ν=0) <- 3Σg -(ν=0) transition in oxygen molecules. The molar absorption coefficient corresponding to the spectral maximum of this transition was estimated from the observed photoreaction rates.