Creating a stationary fluorinated environment inside thezeolite cavity can increase the reactivity observed forintrazeolite photooxidation of alkenes. Exchanging the zeolitewith fluorinated organic cations is a much more effectivestrategy than simply using a fluorinated solvent for slurryirradiations. Use of cations containing C−F bonds is alsomore efficient than use of deuterated cations for creation ofa singlet oxygen friendly environment where the quenchingprocesses are slowed down. Doping the zeolite with fluoro-organic cation 4 resulted in an increase in the singlet oxygenlifetime to 12 μs.