Abstract
The palladium complex of 1,6,10,15,19,24,28,33-octabutoxynaphthalocyanine, PdNc(OBu) 8 , is shown to undergo reversible addition of O 2 in benzene solution at ambient temperature (22±1 o C) during steady-state photolysis with an Ar ion laser. On the basis of 1 H-NMR and electronic absorption spectral evidence, the photoadduct is postulated to be an endoperoxide which has molecular oxygen added to one of the benzene rings at the sites a to the point of fusion with the tetrapyrrole ring, i.e., the positions bearing butoxy substituents. The formation of this product probably involves O 2 ( 1 Δ g )
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