Abstract
Irradiation of the title compound having a 9-anthryl ( 1a) or a 1-pyrenyl group ( 1b) in methanol was found to give the heterolytic CO bond cleavage products: 1-hydroxy-2-pyridone and arylmethyl methyl ether, (which predominate for the reaction of 1a), along with 2-pyridone, aryl-substituted methanol and aryl aldehyde derived from the homolysis of the NO bond (that mainly occurs in the photolysis of 1b). Spectroscopic analysis of the ground-state and excited singlet-state behavior of 1 revealed that a non-emissive intramolecular exciplex (whose formation rate is much faster in 1a than in 1b) plays a key role in inducing the CO bond heterolysis.
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