Acetone, chloroacetone, 4-heptanone, 8-pentadecanone, 12-tricosanone, and dimethyl γ-keto pimellate were photolyzed at 3130 Å in carbon tetrachloride solution. The quantum yields of C 2 Cl 6 formed, the decrease in Norrish type I and type II products, the copious yields of HCl and the Stern–Volmer quenching of ketone fluorescence by carbon tetrachloride provide definitive evidence for energy transfer which is rationalized by an exciplex mechanism of low efficiency. The excited [n,π*] 1 state of the ketone forms a loose complex with the CCl 4 and radiationless energy transfer leads to dissociation of the CCl 4 in the primary chemical step.
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Pavlik et al. (1973) studied this question.