Fig. 5. (a) Product turnovers in the [2 + 2] cycloaddition of 1a to 2a by UiO-68[Au1]4.5% or Au1 (referring to [Au(C^N^C)(NHC)]PF6); (b) substrate conversion and product yield in recycling experiments with ten reaction cycles using UiO-68[Au1]4.5% as the photocatalyst in the given reaction; (c and d) photographs of the photocycloaddition of 1a involving UiO-68[Au1]4.5% or Au1, taken after the reaction; (e) PXRD patterns of UiO-68-Me (simulated) and UiO-68[Au1]4.5% before and after catalysis (measured).
