Abstract
A photochromic system working in the red-near IR region is described. The photooxygenation of the palladium complex of octaphenyltetraantltra-porphyrazine 1 ( λ max = 846 nm in benzene) in the presence of molecular oxygen is studied by absorption spectroscopy. Species with different absorption behaviour are formed and detected in the spectral range 600–850 nm. The final photoproduct is assigned to be a substituted palladium phthalocyanine 2 containing four trans-annular endoperoxide bridges in the middle part of the anthracene unit. The formation of this photoproduct involves singlet oxygen. Excitation of the photoproduct 2 into higher excited electronic states by UV-laser light results in the release of molecular oxygen and regeneration of the starting molecule 1.
Published Version
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